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Dr. Sandra J. Quintanilla

Professor

University of North Texas

Department of Physics

(940) 565-4739

Email: squintanilla@unt.edu

Education

  • PhD, University of London, 1986
    Major: Physics
    Dissertation: A Theoretical Study of Elastic Electron Positronium Scattering and Photo-absorption by the Positronium Negative Ion
  • BS, University of London, 1983
    Major: Physics

Professional Positions

  • Associate Professor, University of North Texas Denton, Texas. University of North Texas Denton, Texas. (1997 - 2007).
  • Institute of TheoreticalAtomic and Molecular Physics, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts. Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts. (1999 - 1999).
  • Visiting Scientist on Sabbatical Leave, (1999 - 1999).
  • Visiting Professor on Sabbatical Leave, UniversityofTennessee, Knoxville,Tennessee. UniversityofTennessee, Knoxville,Tennessee. (1998 - 1999).
  • Assistant Professor, Universityof NorthTexas, Denton,Texas. Universityof NorthTexas, Denton,Texas. (1991 - 1997).
  • Postdoctoral ResearchAssociate to Professor J. H. Macek, UniversityofTennessee, Knoxville,Tennessee. UniversityofTennessee, Knoxville,Tennessee. (1988 - 1991).
  • Postdoctoral ResearchAssociate to Professors A. D. Stauffer, York University,Toronto, Canada. York University,Toronto, Canada. (1986 - 1988).
  • Student Summer Job, Culham Laboratories, England. Culham Laboratories, England. (1983 - 1983).

    • Academic - Post-Secondary

  • Professor(Tenured), University of North Texas Denton, Texas. University of North Texas Denton, Texas. (2007 - Present).
  • Dr./Professor (Tenured)/Faculty Development Leave, University of North Texas. University of North Texas. (2018 - 2018).

Professional Memberships

  • Division of Atomic, Molecular and Optical Physics of the American Physical Society (APS). (1993 - Present).
  • Texas Section of the APS, STX. (1993 - Present).
  • Topical Group on Few-Body Systems. (1993 - Present).
  • American Physical Society. (1987 - Present).
  • Topical Group on Few-Body Systems. (2008 - 2011).
  • Topical Group on Few-Body Systems and Multi-particle Dy¬namics of the APS. (1989 - 1990).

Development Activities

  • Faculty Development Leave, Professor, University of North Texas. United States of America. (2018 - 2018).

Teaching

Teaching Experience

    University of North Texas

  • PHYS 3310 - Mathematical Methods in the Physical Sciences, 22 courses.
  • PHYS 4210 - Electricity and Magnetism, 2 courses.
  • PHYS 4310 - Quantum Mechanics, 23 courses.
  • PHYS 4900 - Special Problems, 2 courses.
  • PHYS 4910 - Special Problems, 6 courses.
  • PHYS 4950 - Senior Thesis, 2 courses.
  • PHYS 4955 - Senior Thesis Capstone, 2 courses.
  • PHYS 5500 - Quantum Mechanics I, 8 courses.
  • PHYS 5510 - Quantum Mechanics II, 5 courses.
  • PHYS 5900 - Special Problems, 11 courses.
  • PHYS 5910 - Special Problems, 8 courses.
  • PHYS 5920 - Research Problems in Lieu of Thesis, 2 courses.
  • PHYS 5930 - Research Problems in Lieu of Thesis, 1 course.
  • PHYS 6000 - Mathematical Methods of Physics I, 2 courses.
  • PHYS 6900 - Special Problems, 2 courses.
  • PHYS 6910 - Special Problems, 5 courses.
  • PHYS 6940 - Individual Research, 17 courses.
  • PHYS 6950 - Doctoral Dissertation, 25 courses.

Non-Credit Instruction

  • Seminar, Physics Department, (March 29, 2022 - March 29, 2022).
  • Seminar, (July 10, 2018 - July 10, 2018).
  • Seminar, (April 11, 2018 - April 11, 2018).
  • Seminar, (April 27, 2017 - April 27, 2017).

Directed Student Learning

  • Major Professor, "Electron-Positronium Scattering and the Positronium Negative Ion," Physics. (2020).
  • Major Professor, "Project 1: Electron- and Positron Impact Ionization of Hydrogen and Helium. Project 2: Positron-, Electron and Positronium Elastic Scattering of Helium.," Physics. (2017).
  • Supervised Research (Mr. Gabriel Medrano started to work on research with me Spring 2016. I was his Major Professor until August 2019. Mr. Medrano has continued to do some work under my supervision.), "The bound-state of the Positronium - Positronium System.," Physics. (2017 - 2023).
  • Supervised Research, "Variational method," Physics. (2021 - 2021).
  • Major Professor, "Deep Minima and Vortices for Positronium Formation in positron-hydrogen and positronium helium collisions," Physics. (2016 - 2021).
  • Supervised Research, "Senior Thesis: Comparison of Elastic, Momentum, and Differential Cross Sections of Various Systems," Physics. (January 2020 - August 2020).
  • Dissertation Committee Member, "On Ph.D. dissertation committee," Physics. (2014 - 2018).
  • Other, "On Ph.D. dissertation committee," Physics. (2014 - 2018).
  • Supervised Research, "Positronium Formation in positron-hydrgen collisions," Physics. (2016 - 2017).
  • Undergraduate Honors Thesis (Undergraduate Senior Thesis Phys. 4950 and Senior Thesis capstone Phys. 4955), Physics. (2016 - 2017).
  • Other, "On Ph.D. dissertation committee," Physics. (2016).
  • Other, "Not. Project/Thesis/Dissertation.," Physics. (2015 - 2016).
  • Supervised Research (Student took special problems course in 2015), Physics. (2015 - 2015).
  • Other, "On Ph.D. dissertation committee," (2012 - 2015).
  • Dissertation Committee Chair, "Dissertation. Variational Calculations of Positronium Scattering with Hydrogen," Physics. (2008 - 2015).
  • Other, "Was on Ph.D. dissertation committee," (2003 - 2014).
  • Other, (2011 - 2011).
  • Supervised Research, Physics. (2007 - 2007).
  • Other, (2006 - 2006).
  • Other, (2005 - 2005).
  • Other, (2003 - 2003).
  • Other, (2001 - 2001).
  • Other, (1994 - 1999).
  • Other, (1994 - 1999).
  • Other, "(e, 2e) collisions project," Physics. (1997 - 1997).
  • Supervised Research, "(e, 2e) project," Physics. (1996 - 1997).
  • Other, (1994 - 1997).
  • Other, (1994 - 1997).
  • Other, (1994 - 1997).
  • Other, (1994 - 1997).
  • Other, (1994 - 1997).
  • Other, (1994 - 1997).

Awards and Honors

  • Nominated for 2018-2019, Professor of the year, UNT Physics. (May 2019).
  • Graduate student, Jason Hunnell, received a special recognition of his contributed paper. He receivedanawardof $200, Texas Section of the American Physical Society (APS), Texas Christian University. (2001).
  • Selectedforappointment asaLongTerm Visitor, Smithsonian Astro¬physical Observatory's Institute for TheoreticalAtomic and Molecular Physics. (1999).
  • Who's Who in Science and Engineering, 4th Edition, (1998).
  • Selectedforappointment asa ShortTerm Visitor, Smithsonian Astro¬physical Observatory's Institute for TheoreticalAtomic and Molecular Physics. (1997).
  • Who's Who Among America'sTeachers, (1996).
  • Valerie Myserscough Prize, Universityof London. (1985).
  • Valerie Myserscough Prize, Universityof London. (1984).

Research

Published Intellectual Contributions

    Abstract for a conference

  • Ward, S.J., Van Reeth, P. (2016). Deep Minimum in the Differential Cross Section for Ps Formation in Positron-Hydrogen Collisions. 61 (8) 193.

    • Abstract for a national conference

  • DeMars, C.M., Kent, J.B., Ward , S.J. (2019). Deep minimum in the Coulomb-Born TDCS for e$^-$-He and e$^+$-He ionization. Bulletin of the American Physical Society. 64 (4) L01 13, 119 (1 pp)). http://meetings.aps.org/Meeting/DAMOP19/Session/L01.13
  • Ward , S.J., Alrowaily, A.W., Van Reeth, P. (2019). Multichannel Effective Range Theory Analysis of Zeros in the Positronium formation Scattering Amplitude for Positron-Hydrogen Collisions. Bulletin of the American Physical Society. 64 (4) E01 32, 50-51 (2 pp). American Physical Society. http://meetings.aps.org/Meeting/DAMOP19/Session/E01.32
  • Medrano, G., Ward , S.J., Van Reeth, P. (2019). Variational Calculations of the Ps-Ps System. Bulletin of the American Physical Society. 64 (4) S01 25, 193 (1pp). http://meetings.aps.org/Meeting/DAMOP19/Session/S01.2

    • Abstracts and Proceedings

  • Ward Quintanilla, S.J., DeMars, C.M. (2023). Deep minima in the Coulomb-Born triply differential cross sections for electron and positron ionization of hydrogen and helium. Bulletin of the American Physical Society. 68 (7) https://meetings.aps.org/Meeting/DAMOP23/Session/K04.3
  • Ward Quintanilla, S.J. (2023). Electron-Positronium Scattering and the Photodetachment of the Positronium Negative Ion. https://meetings.aps.org/Meeting/GEC23/Session/GT3.1
  • Ward Quintanilla, S.J., Mitchell, W. (2023). Photodetachment of the Positronium Negative Ion (Ps$^-$) and the $^1$D-wave e$^-$-Ps scattering. Bulletin of the American Physical Society. 68 (7) https://meetings.aps.org/Meeting/DAMOP23/Session/N01.22
  • Ward, S.J., Mitchell, W.J. (2022). $^{1,3}S$ and $^{1,3}P$ electron-positronium scattering. Bulletin of the American Physical Society. 67 (7) Abstract F01.00021. Dept of Physics
  • DeMars, C.M., Claypool, J., Ward Quintanilla, S.J., Van Reeth, P. (2021). Comparison of elastic scattering of electron, positron and positronium from helium. Bulletin of the American Physical Society. 66 (Number 6) V01.00017. American Physical Society. https://meetings.aps.org/Meeting/DAMOP21/Session/V01.17
  • DeMars, C.M., Josiah, C.J., Ward, S.J., Van Reeth, P. (2021). Comparison of phase shifts and cross sections as a function of velocity for positron, electron and positronium elastic scattering from helium. Bulletin of the American Physical Society. 66 (Number 7) GT61.00061. American Physical Society. https://meetings.aps.org/Meeting/GEC21/Session/GT61.61
  • Mitchell, W.J., Ward Quintanilla, S.J. (2021). Singlet p-wave elastic electron-positronium scattering}". Bulletin of the American Physical Society. 66 (Number 7) GT61.00071. American Physical Society. https://meetings.aps.org/Meeting/GEC21/Session/GT61.71
  • Quintanilla, S.J., Medrano, G., Van Reeth, P.J. (2021). Variational calculations of the bound-state energy of Ps$_2$. Bulletin of the American Physical Society. 66 (Number 6) N01.00002. American Physical Society. https://meetings.aps.org/Meeting/DAMOP21/Session/N01.2
  • DeMars, C.M., Ward, S.J., Kent, J.B. (2020). Deep minima in the Coulomb-Born triply differential cross section for electron and positron ionization of hydrogen and helium. Bulletin of the American Physical Society. 65 (4) American Physical Society. http://meetings.aps.org/Meeting/DAMOP20/Session/Q01.26
  • DeMars, C.M., Ward, S.J., Kent, J.B. (2020). Deep minima in the Coulomb-Born triply differential cross section for electron and positron ionization of hydrogen and helium. Bulletin of the American Physical Society. http://meetings.aps.org/Meeting/GEC20/Session/LT1.3
  • Ward, S.J., Alrowaily, A.W., Van Reeth, P. (2020). Deep minimum in the Ps-formation differential cross section for positron-helium collisions in the Ore Gap. Bulletin of the American Physical Society. 65 (4) http://meetings.aps.org/Meeting/DAMOP20/Session/E01.28
  • S. J. Ward, Denton Woods, and P. Van Reeth. (2015). An Investigation of Positronium-Hydrogen Collisions. 60 (7) 182-183. http://meetings.aps.org/link/BAPS.2015.DAMOP.Q1.112
  • S. J. Ward and J. H. Macek. (2014). http://meetings.aps.org/link/BAPS.2014.DAMOP.Q1.37
  • S. J. Ward and J. H. Macek. (2014). http://meetings.aps.org/link/BAPS.2014.GEC.MW1.7
  • Denton Woods, P. Van Reeth and S. J. Ward. (2014). http://meetings.aps.org/link/BAPS.2014.DAMOP.Q1.55
  • S. J. Ward and J. H. Macek. (2013). Deep minimim in the Coulomb-Born TDCS for inner-shell ionization of carbon by electron impact. http://meetings.aps.org/link/BAPS.2013.GEC.HW1.19
  • S. J. Ward. (2013). Positron Collisions from Simple Atoms and Positronium-Hydrogen Collisions. http://meetings.aps.org/link/BAPS.2013.GEC.KW5.1
  • Denton Woods, S. J. Ward and P. Van Reeth. (2013). Variational Calculations of Low-Energy Elastic Ps-H Scattering. http://meetings.aps.org/link/BAPS.2013.DAMOP.Q1.122
  • Denton Woods, S. J. Ward and P. Van Reeth. (2012). Low-energy S- and P-wave Positronium-Hydrogen Collisions.
  • S. J. Ward and J. Shertzer. (2011). Hyperspherical hidden crossing calculation of Ps formation in low-energy e^+-Na collisions.
  • D. Woods, S. J. Ward and P. Van Reeth. (2011). Low-Energy S-Wave Positronium-Hydrogen Collisions.
  • S. J. Ward and J. H. Macek. (2011). Vortices in Coulomb-Born calculations for inner-shell ionization of carbon by electron-impact.
  • Janine Shertzer and S. J. Ward. (2010). Binding Energy and Geometry of e^+Na.
  • D. Woods, S. J. Ward and P. Van Reeth. (2010). The Binding Energy of PsH.
  • Janine Shertzer and S. J. Ward. (2009). Binding Energy Calculations for e^+Li and e^+Na.
  • S. J.Ward, J. H. Macek and S. Yu. Ovchinnikov. (1997). "The Hidden Crossing Method Applied toPositroniumFormation".
  • S.J.Ward. (1993). "RecentDevelopmentsinthe TheoryofPositron-Hydrogen Collisions".
  • R.P. McEachran, M. Horbatsch, A. D. Stauffer and S. J. Ward. (1990). "Positron-AlkaliAtom Scattering".
  • M. Horbatsch, S. J.Ward, McEachran and A. D. Stauffer. (1990). "Resonances inPositron-Alkali Close-Coupling Calculations".
  • A. D. Stauffer, K. Bartschat, R. I. Campeanu, M. Horbatsch, R.P. McEachran, L. A.Parcell and S. J.Ward. (1990). "Theoretical Calculations of Positron Collisions with Atoms".
  • S.J.Ward,J.W.Humberstonand M. R. C. McDowell. (1986). "The ScatteringofLow-Energy ElectronsbyPositronium".

    • Journal Article

  • Alrowaily, A.W., Ward, S.J., Van Reeth, P. (2021). Deep Minimum and a Vortex for Positronium Formation in Low-Energy Positron-Helium Collisions. ATOMS. 9 56. MDPI. https://www.mdpi.com/2218-2004/9/3/56
  • DeMars, C.M., Ward, S.J., Colgan, S.J., Amami, S., Madison, D.H. (2020). Deep Minima in the Triply Differential Cross Section for Ionization of Atomic Hydrogen by Electron and Positron Impact. 8(2) 26 (12 pages). MDPI. https://www.mdpi.com/2218-2004/8/2/26
  • DeMars, C.M., Kent, J.B., Ward, S.J. (2020). Deep minima in the Coulomb-Born triply differential cross sections for ionization of helium by electron and positron impact. The European Physical Journal D. 74 48 (pages 1-8). SpringerLink. https://link.springer.com/article/10.1140/epjd/e2019-100512-x
  • Alrowaily, A.W., Ward , S.J., Van Reeth, P. (2019). Deep minima and vortices for positronium formation in low-energy positron-hydrogen collisions. Journal of Physics B: Atomic, Molecular and Optical Physics. 52 205201 (11pp). Bristol, Institute of Physics.
  • Van Reeth, P., Woods, D., Ward, S.J., Humberston, J.W. (2016). Corrigendum: Comparison of positronium, positron and electron scattering. Journal of Physics B: Atomic, Molecular and Optical Physics. 49 169501 (1pp).
  • Van Reeth, P., Woods, D., Ward, S.J., Humberston, J.W. (2016). Comparison of positronium, positron and electron collisions with hydrogen at low velocities. Journal of Physics B: Atomic, Molecular and Optical Physics. 49 114001.
  • Woods, D., Ward, S.J., Van Reeth, P. (2015). Detailed investigation of low-energy positronium-hydrogen scattering. Physical Review A. 92 022713-1 -- 022713-17. http://journals.aps.prg/pra
  • Ward, S.J., Macek, J.H. (2014). Effect of a vortex in the triply differential cross section for electron impact K-shell ionization of carbon. 90 062709. http://journals.aps.org/pra/
  • J. Shertzer and S. J. Ward. (2010). Binding Energy and Structure of e^+Na,.
  • Krista Jansen,S.J.Ward,J. ShertzerandJ.H. Macek. (2009). "Absolute Cross Section for Positron-Impact Ionization of Hydrogen Near Threshold".
  • Krista Jansen, S. J.Ward,. (2008). "Near-ThresholdPositron Impact Ionization of Hydrogen".
  • S. J.Ward, J. Shertzer, S.Yu. Ovchinnikov and J. H. Macek. (2007). "Optimizing the Paths for Including the Correction Term to the Hyperspherical Hidden Crossing Method: Application to Formationine+ -Li Collisions".
  • S.J.Ward. (2007). "The Photodetachmentof Ps− and Low-Energye+ -H Collisions".
  • J. Shertzer and S. J.Ward. (2006). "Binding Energy and Structure of e+ Li and e− Li using a Parametric Model Potential".
  • S. J.Ward and J. Shertzer. (2005). "PositroniumFormation Cross Section forPositron-Lithium Collisions".
  • S. J.Ward and J. Shertzer. (2004). "E ff ect of the Core Polarization Term on Ps Formation in Low-Energy e+ -Li Collisions".
  • J. Sandstr¨om,G. Haeffler, I. Kiyan, U. Berzinsh, D. Hanstorp, D. J.Pegg, J. C. Hunnell and S. J.Ward. (2004). "E ff ectofPolarizationon Photodetachment Thresholds".
  • S. J.Ward and J. Shertzer. (2003). "ApplicationoftheHyperspherical Hidden Crossing MethodtoPositron-Lithium Collisions".
  • S. J.Ward. (2002). "Positronium Formation in Low-Energy Positron Collisions with One-and Two-Electron Atoms".
  • S.J.Ward,J.C. HunnellandJ.H. Macek. (2002). "The E ff ect of thePolarizationPotential on Low-EnergyAtomic Processes".
  • S. J. Ward and J. H. Macek. (2000). "E ff ective Range Analysis of Positron-Hydrogen Collisions".
  • S.J.Ward,J.H. Macek and S.Yu.. (1999). "Applicationof the Hidden Crossing Method to Positronium Formation".

    • Other

  • Ward , S.J., Alrowaily, A.W., Reeth, P.V. (2018). Vortices for Ps formation in positron-hydrogen collisions Acceptance in the Ore Gap. Bulletin of the American Physical Society. 63 (No. 5) T01 31 pg 189. American Physical Society. http://meetings.aps.org/Meeting/DAMOP18/Session/T01.31
  • Ward, S., Kent, J.B. (2017). Deep minimum in the Coulomb-Born TDCS for electron-impact ionization of atomic hydrogen. Bulletin of the American Physical Society. 62 (Issue Number 10) 28 (GT1 1). http://meetings.aps.org/Meeting/GEC17/Session/GT1.1
  • Ward, S.J., Van Reeth, P., Alrowaily, A.W. (2017). Vortices for Ps formation in positron-hydrogen collisions. Bulletin of the American Physical Society. 62 (Issue Number 8) 137 (K1 148). American Physical Society. http://meetings.aps.org/Meeting/DAMOP17/Session/K1.148

    • Popular Press Article

  • Krista Jansen,S.J.Ward,J. Shertzerand J.H. Macek. (2008). "Absolute Cross Section forPositron Impact Ionization of Hydrogen Near Threshold".
  • Krista Jansen, S. J.Ward, J. Shertzer and J. H. Macek. (2007). "Near ThresholdPositron Impact Ionization of Hydrogen".
  • S.Ward andJ. Shertzer. (2003). "The Application of the Hyperspherical Hidden Crossing Method toPositroniumFormation inPositron-Lithium Scattering".
  • J.Ward and J. Shertzer. (2002). "Hyperspherical Hidden Crossing CalculationofPositron-Lithium Collisions".
  • J. C. Hunnell, S. J.Ward, J. Sandstrom - D. Hanstorp and D. J.Pegg. (2002). "Photodetachment of Alkali Negative Ions".
  • S. J.Ward. (2001). "E ff ective Range Theory Analysis ofPositron-Helium Collisions".
  • S. J.Ward and J. H. Macek. (2000). "Virtual State of thePositronium-Proton System".
  • S. J.Ward and J. H. Macek. (1999). "Analysis of Positron-Hydrogen Collisions using an E ff ective Range Theory".
  • S.J.Ward,J.H. Macekand S.Yu. Ovchinnikov. (1998). "Hidden Crossing Method AppliedtoPositroniumFormation".
  • S. J.Ward, J. H. Macek and S.Yu. Ovchinnikov. (1998). "Hidden Crossing Theory Applied to Ps-formation inPositron-Hydrogen Collisions".
  • S. J.Ward, E. G. Roth, B. N. Guo, D. E. Golden and D. W. Mueller. (1997). "Anti-Capture to the Continuum via a Double Collision Mechanism in (e,2e) Collisions".
  • S. J.Ward, J. H. Macek and S.Yu. Ovchinnikov. (1997). "The Hidden Crossing Method Applied toPositroniumFormation".
  • S.J.Ward, J. H. Macek and S.Yu. Ovchinnikov. (1996). "The Hidden Crossing Method Applied to Positronium Formation".
  • S.J.Ward. (1995). "Recent Developmentin the TheoryofFastPositron-Atom Collisions".
  • S. J.Ward and J. H. Macek. (1994). "PositroniumFormationbyElectronic Capture from Hydrogenic Ions".
  • S.J.Ward andJ.H. Macek. (1994). "Single and Double Photoionizationof Helium".
  • S.J.WardandJ.H. Macek. (1994). "WaveFunctionsforContinuum Statesof ChargedFragments".
  • S. J. Ward and J. H. Macek. (1991). "A Variational Principle for Time-Dependent Interactions".
  • S.J.Ward,M. Horbatsch,R.P. McEachranandA.D. Stauffer. (1989). "Close-Coupling ApproachtoPositron Scattering for Lithium, Sodium andPotassium".
  • S.J.Ward,M. Hor¬batsch, R. P. McEachran and A. D. Stauffer. (1989). "Close-Coupling CalculationsofLow-EnergyPositron-Alkali Collisions".
  • S.J.Ward,M. Horbatsch, R.P. McEachran and A. D. Stauffer. (1989). "ResonancesinLow-EnergyPositron ScatteringfromLi,NaandK".
  • S.J.Ward,M. Horbatsch, R.P. McEachran and A. D. Stauffer. (1988). "Close-coupling ApproachtoPositron Scattering fromPotassium".
  • S.J.Ward,M. Hor¬batsch,R.P. McEachranandA.D. Stauffer. (1988). "Theoretical StudiesofLow-EnergyPositron-AlkaliAtom Scattering".
  • S. J. Ward, J. W. Humberston and M. R. C. McDowell. (1987). "Elastic Scattering of Electrons (or Positrons) from Positronium and the Photodetachment of the Positronium Negative Ion".
  • S. J.Ward, J. W. Hum¬berston and M. R. C. McDowell. (1986). "The Photodetachment of the Negative Ion ofPositronium (Ps−)".
  • S.J.Ward,J.W. Hum¬berston and M. R. C. McDowell. (1985). "The ScatteringofLow-Energy S-Wave ElectronsbyPositronium".

Presentations Given

  • A comparison of positron, electron and positronium low-energy scattering from hydrogen,, (2015 - 2015).
  • An Investigation of Positronium-Hydrogen Collisions, (2015 - 2015).
  • Elaborate calculations of low-energy Ps-H collisions, (2015 - 2015).
  • A vortex line for K-shell ionization of carbon by electron impact, (2014 - 2014).
  • Low-energy D-wave positronium-hydrogen scattering, (2014 - 2014).
  • Positronium-hydrogen scattering for the first six partial waves, (2014 - 2014).
  • Variational calculations of positronium-hydrogen scattering for L=0 to 5, (2014 - 2014).
  • Vortices for K-shell ionization of carbon by electron impact, (2014 - 2014).
  • Computation of Low-Energy Positronium-Hydrogen Collisions, (2013 - 2013).
  • Deep minimim in the Coulomb-Born TDCS for inner-shell ionization of carbon by electron impact, (2013 - 2013).
  • Positron collisions from simple atoms and positronium-hydrogen collisions, (2013 - 2013).
  • Variational calculations of low-energy elastic Ps-H scattering, (2013 - 2013).
  • Denton Woods, S. J. Ward and P. Van Reeth, (2012 - 2012).
  • Denton Woods, S. J. Ward and P. Van Reeth, (2012 - 2012).
  • J. H. Macek and S. J. Ward, (2012 - 2012).
  • D. Woods, S. J. Ward and P. Van Reeth, (2011 - 2011).
  • Denton Woods, S. J. Ward and P. Van Reeth, (2011 - 2011).
  • S. J. Ward and J. H. Macek, (2011 - 2011).
  • S. J. Ward and J. Shertzer, (2011 - 2011).
  • S. J. Ward and J. Shertzer, (2011 - 2011).
  • D. Woods, S. J. Ward and P. Van Reeth, (2010 - 2010).
  • J. Shertzer and S. J. Ward, (2010 - 2010).
  • Positron Impact Ionization of Atomic Hydrogen Near Threshold, (2009 - 2009).
  • "Absolute Cross Section forPositron Impact Ionization of Hydrogen Near Threshold",S. J. Ward, Krista Jansen, Janine Shertzer and J. H. Macek, 39th DAMOP meeting of the APS May27-31, 2008,Penn State University, State College,Pennsylvania., (2008 - 2008).
  • "Near ThresholdPositron Impact Ionization of Hydrogen", Krista Jansen, S. J.Ward, J. Shertzer and J. H. Macek, 38th DAMOP meeting of the APS June 5-9, 2007, Calgary, Canada., (2007 - 2007).
  • "Near-ThresholdPositron Impact IonizationofAtomic Hydrogen",S.J.Ward, Krista Jansen, J. Shertzer,J.H. MacekandS.Yu.Ovchinnikov,XIVInternationalWorkshoponLowEnergyPositron&PositroniumPhysics&XVInternationalSymposiumon Electron-Molecule Collisions, (2007 - 2007).
  • "Optimizing the Paths for Including the Correction Term to the Hyperspherical Hidden Crossing Method: ApplicationtoPsFormationine-Li Collisions", (2007 - 2007).
  • 5. "Near-Threshold S-wave Positron-Hydrogen Ionization", Krista Jansen, S. J.Ward, J. Shertzer, and J. H. Macek, Joint Spring Meeting of theTexas Sections APS, AAPT, FIAP and SPS, March22-24, 2007, Abilene Christian University, Abilene, TX., (2007 - 2007).
  • "Binding Energy of el Li using the Peach Model Potential", J. Shertzer and S. J.Ward, 37th DAMOP meeting of the APS May16-20, 2006, Knoxville,Tennessee., (2006 - 2006).
  • "Optimizing the Paths for Including the Correction Term to the Hyperspherical Hidden Crossing Method: ApplicationtoPsFormationine-Li Collisions", S. J.Ward, J. Shertzer, S.Yu. Ovchinnikov and J. H. Macek, (2006 - 2006).
  • 4. "Application of the Hyperspherical Hidden Crossing Method to Near-Threshold Positron-Hydrogen Ionization", Krista Jansen, S. J. Ward, J. H. Macek and J. Shertzer, Joint Fall Meeting of theTexas Sections APS, AAPT, FIAP and SPS, October 5-7, 2006, (2006 - 2006).
  • "Hyperspherical Hidden Crossing Calculation of Ps formation Cross Section for Low-Energy Collisions",J. Shertzer andS.J.Ward,36th DAMOP meeting of the APS, May17-21, 2005, Lincoln, Nebraska., (2005 - 2005).
  • "Application of the Hyperspherical Hidden Crossing Method to Positron Collisions", Eigh¬teenth International Conference on the Application of Accelerators in Researchand Industry, Ft.Worth,Texas, October 10-15, 2004., (2004 - 2004).
  • "Higher Order Corrections to the Wannier Threshold Law for Positron Scattering", James Sternberg,S.J.Ward,J.H. Macek andJ. Shertzer, 2004DAMOP meetingof the APS,May 22-29, 2004,Tucson, Arizona., (2004 - 2004).
  • "Low-EnergyPositron-Lithium Collisions",S.WardandJ. Shertzer,XIIInternationalWork¬shop on"Positron andPositroniumPhysics", Sandberg, Denmark, July 19-21, 2003, (Satellite Meeting to ICPEAC2003)., (2003 - 2003).
  • "The Application of the Hyperspherical Hidden Crossing Method toPositroniumFormation inPositron-Lithium Scattering",S.WardandJ. Shertzer,2003DAMOP meetingoftheAPS, May21-24, 2003, Boulder, Colorado, (2003 - 2003).
  • "Hyperspherical Hidden Crossing CalculationofPositron-Lithium Collisions",S.J.Ward and J. Shertzer, 2002DAMOP meetingof the APS,May29 -June1, 2002, The Collegeof William and Mary, Williamsburg, Virginia., (2002 - 2002).
  • "Photodetachment of Alkali Negative Ions", J. C. Hunnell, S.J.Ward, J. Sandstrom, D. HanstorpandD.J.Pegg,2002 DAMOP meetingoftheAPS,May29-June1,2002,The College of William and Mary, Williamsburg, Virginia., (2002 - 2002).
  • "TheoreticalTreatmentofLow-EnergyPositron Collisions",SeventeethInternational Confer¬ence on the Application of Accelerators in Researchand Industry, Denton,Texas, November 12-16, 2002., (2002 - 2002).
  • 3. "Photodetachment of Alkali Negative Ions", J. C. Hunnell, S. J. Ward, J. Sandstrom, D. HanstorpandD.J.Pegg,Texas Section 2002 Spring Meeting of the APS,March7-9,2002, Austin State University, Nacogdoches,Texas., (2002 - 2002).
  • "AnalysisofPositron-HydrogenandPositron-Helium Collisions",S.J.WardandJ.H. Macek, 11th WorkshoponLow EnergyPositronandPositroniumPhysics,SantaFe,New Mexico,July 25-27, 2001, (Satellite Meeting to ICPEAC2001)., (2001 - 2001).
  • "AnalysisofPositron-HydrogenandPositron-Helium Collisions",S.J.WardandJ.H. Macek, XXII ICPEAC, July 18-24, 2001, SantaFe, New Mexico., (2001 - 2001).
  • "Effective Range Theory Analysis ofPositron-Helium Collisions", S. J.Ward, 2001DAMOP meeting of the APS, May16-19, 2001, London, Ontario, Canada., (2001 - 2001).
  • Quintanilla, S.J. (Other), "Near-Threshold Behavior of Atomic Processes",, (2001 - 2001).
  • "Photodetachment of Lithium Negative Ion(Li(2sS)intoe − Li(2p) above the Li(2p) threshold",J.C. Hunnelland S.J. Ward,Texas Section 2001 Fall Meeting of the APS,October 4-6, 2001,Texas Christian University,Fort Worth,Texas., (2001 - 2001).
  • "The Effect of the Polarization Potential on Low-Energy Atomic Processes", invited paper in the session 'Positron Bound States & Atomic Collisions', 11th Workshop on Low Energy PositronandPositroniumPhysics,SantaFe,New Mexico,July25-27,2001, (2001 - 2001).
  • "EffectofPolarizationonPositroniumFormation", SixteenthInternational Conferenceonthe Application of Accelerators in Researchand Industry, Denton,Texas, November 1-4, 2000., (2000 - 2000).
  • Quintanilla, S.J. (Other), "Near-ThresholdPositroniumFormationinPositron-Hydrogen Collisions",, (2000 - 2000).
  • "Virtual StateofthePositronium-Proton System",S.J.WardandJ.H. Macek, 2000DAMOP meeting of the APS, June 14-17, 2000, Storrs, Connecticut., (2000 - 2000).
  • "Analysis of Positron-Hydrogen Collisions Using Effective Range Theories", S. J. Ward and J. H. Macek, XXI ICPEAC, July 22-27, 1999, Sendai, Japan., (1999 - 1999).
  • "Analysis ofPositron-Hydrogen Collisions using an Effective Range Theory", S. J.Ward and J. H. Macek, APS Centennial Meeting withDAMOP, March20-26, 1999,Atlanta, GA., (1999 - 1999).
  • "Hyperspherical Hidden Crossing Theory of Positronium Formation", Hyperspherical Har¬monic MethodsinAtomic, Molecularand NuclearPhysics, Institutefor Nuclear Theory, Uni¬versityofWashington, Seattle,Washington, January 25-29, 1999., (1999 - 1999).
  • Quintanilla, S.J. (Other), "Near-Threshold Positronium Formation in Positron-Hydrogen Collisions", (1999 - 1999).
  • Quintanilla, S.J. (Other), "Near-Threshold Positronium Formation in Positron-Hydrogen Collisions", (1999 - 1999).
  • "Near-Threshold Positronium Formationin Positron-Hydrogen Collisions",Workshopon Low-Energy Positron and Positronium Physics, (Satellite Meeting to XXI ICPEAC, Sendai, Japan, 22-27 July, 1999), Tsukuba, Japan, July 28-31, 1999., (1999 - 1999).
  • Quintanilla, S.J. (Other), "Positron Collisions:PositroniumFormation", (1999 - 1999).
  • Quintanilla, S.J. (Other), "Positronium Formation in Positron-Hydrogen Collisions",, (1999 - 1999).
  • "Hidden Crossing Theory Applied to Ps-formation inPositron-Hydrogen Collisions", (1998 - 1998).
  • "Anti-Capture to the Continuum via a Double Collision Mechanism in (e,2e) Collisions", (1997 - 1997).
  • "Positronium Formation in Low-Energy Positron-Hydrogen Collisions", (1997 - 1997).
  • "Positronium Formation in Low-Energy Positron-Hydrogen Collisions", (1997 - 1997).
  • "The Hidden Crossing MethodAppliedtoPositroniumFormation", (1997 - 1997).
  • "The Hidden Crossing Theory Applied toPositroniumFormation", (1997 - 1997).
  • "The Hidden Crossing Theory AppliedtoPositroniumFormation", (1997 - 1997).
  • "Anti-Capture to the Continuum via a Double Collision Mechanism in (e,2e) Collisions", (1996 - 1996).
  • Quintanilla, S.J. (Other), "Exploring Exotic Three Body Systems", (1996 - 1996).
  • "The Hidden Crossing Method applied toPositroniumFormation", (1996 - 1996).
  • "The Hidden Crossing Method Applied toPositroniumFormation", (1996 - 1996).
  • Quintanilla, S.J. (Other), "Three-Body Problems inPositron and Electron Collisions", (1996 - 1996).
  • Quintanilla, S.J. (Other), "Three-Body Problems inPositron and Electron Collisions", (1996 - 1996).
  • "Single and Double Photoionization of Helium", (1995 - 1995).
  • "Recent Development in the Theory of Fast Positron-Atom Collisions", (1994 - 1994).
  • Quintanilla, S.J. (Other), "Recent Developments in the Theory ofPositron-Atom Collisions", (1994 - 1994).
  • "Single and Double Photoionization of Helium", (1994 - 1994).
  • "Singleand Double Photoionizationof Helium", (1994 - 1994).
  • "Many-Particle Scattering Wave Functions for Coulomb Potentials", (1993 - 1993).
  • Quintanilla, S.J. (Other), "PositroniumFormation and Ionization Cross Sections inPositron-Atom Collisions", (1993 - 1993).
  • "PositroniumFormationby Electron Capture from Hydrogenic Ions", (1993 - 1993).
  • "PositroniumFormationby Electron Capture from Hydrogenic Ions", (1993 - 1993).
  • Quintanilla, S.J. (Other), "Recent Developments in the Theory ofPositron-Atom Collisions", (1993 - 1993).
  • "RecentDevelopmentinthe TheoryofPositron-Atom Collisions", (1993 - 1993).
  • "WaveFunctionsforContinuum Statesof ChargedFragments", (1993 - 1993).
  • Quintanilla, S.J. (Other), Recent Developments in the Theory of Positron-Atom Collisions, (1993 - 1993).
  • Quintanilla, S.J. (Other), "Positron Collisions", (1992 - 1992).
  • "PositroniumFormationbyElectron Capture from Hydrogenic Ions", (1992 - 1992).
  • "Impulse Approximation forPositron Collisions from Hydrogenic Ions", (1991 - 1991).
  • "Impulse Approximation forPositron Collisions from Hydrogenic Ions", (1991 - 1991).
  • Quintanilla, S.J. (Other), "Positron Collisions", (1990 - 1990).
  • "A NewVariational Principle for Time Dependent Interactions", (1989 - 1989).
  • "Resonances in Low EnergyPositron-Alkali Scattering", (1989 - 1989).
  • "Close-Coupling CalculationsofLow-EnergyPositron-Alkali Collisions", (1988 - 1988).
  • "A Theoretical Study of Low EnergyPositron-AlkaliAtom Scattering", (1987 - 1987).
  • Quintanilla, S.J. (Other), "Low-Energy Electron-Positronium Scattering and the Photodetachment of the Positronium Negative Ion", (1987 - 1987).
  • Quintanilla, S.J. (Other), "The Elastic Scattering of Low-Energy ElectronsbyPositronium and the Photodetachment of thePositronium Negative Ion", (1987 - 1987).
  • "Theoretical Studies of Low-EnergyPositron-AlkaliAtom Scattering", (1987 - 1987).
  • Quintanilla, S.J. (Other), "The Elastic Scattering of Low-Energy ElectronsbyPositronium and the Photodetachment of the Positronium Negative Ion", (1985 - 1985).
  • "The Scattering of Low Energy Electrons by Positronium", (1985 - 1985).

    • Invited Talk

  • Ward Quintanilla, S.J. (Author & Presenter), GEC 2023, 76th Annual Gaseous Electronics Conference, Electron-Positronium Scattering and the Photodetachment of the Positronium Negative Ion, APS, University of Michigan, Ann Arbor, Michigan, USA, United States of America. (2023 - 2023).
  • Quintanilla, S. (Author & Presenter), Gaseous Electronics Conference International Online Plama Seminar (GEC IOPS), Deep minima (zeros) in electron- and positron-atom collisional cross sections, GEC, Online, United States of America. (2022 - 2022).
  • Ward, S.J. (Author & Presenter), 72nd Annual Gaseous Electronics Conference, Vortices for positron ionization and positronium formation, College Station, Texas, United States of America. (2019 - 2019).
  • Ward , S.J. (Author & Presenter), Alrowaily, A.W. (Author), Van Reeth, P. (Author), 18th International Conference on Positron Annihilation (ICPA 18), "Vortices in Atomic Collisions", ``Ring Vortices for Positronium Formation in e$^+$-H Collisions", Orlando, USA, United States of America. (2018 - 2018).

    • Oral Presentation

  • Ward Quintanilla, S.J. (Author & Presenter), DeMars, C.M. (Author), DAMOP 2024, Deep minima in the Coulmob-Born triply differential cross sections for electron and positron ionization of hydrogen and helium, Spokane, Washington, United States of America. (2023 - 2023).

    • Other

  • Ward, S. (Presenter), Vortices in atomic collisions [Presentator: S. J. Ward Quintanilla], AMOPP (Atomic, Molecular, Optical and Positron Physics) group, Department of Physics and Astronomy, University College London, London, England, UK, United Kingdom. (2018 - 2018).
  • Quintanilla, S. (Presenter), Vortices in atomic collisions [Presenter in Colloquium: S. J. Ward Quintanilla], Department of Physics, University of Texas at Arlington, United States of America. (2018 - 2018).
  • Ward Quintanilla, S.J. (Author & Presenter), Colloquium, Vortices in atomic collisions, Physics and Astronomy, Texas A&M University Commerce, Physics and Astronomy, Texas A&M University Commerce, United States of America. (2017 - 2017).

    • Poster

  • DeMars, C.M. (Author & Presenter), Ward , S.J. (Author & Presenter), Van Reeth, P. (Author), 2024 DAMOP, Elastic positron and electron scattering from helium using a one-electron model potential, APS, Fort Worth, United States of America. (2024 - 2024).
  • Ward Quintanilla, S.J. (Author & Presenter), Mitchell, W. (Author), 2024 DAMOP, The Photodetachment Cross Section of Ps- and Elastic e^--Ps Scattering, APS, Fort Worth, United States of America. (2024 - 2024).
  • Mitchell, W. (Author & Presenter), Ward, S.J. (Author & Presenter), POSMOL 2023 (XXI International Workshop on Low-Energy Positron and Positronium Physics and XXIII International Symposium on Electron-Molecule Collisions and Swarms), Electron-Positronium Elastic Scattering and the Photodetachment of the Positronium Negative Ion, University of Notre Dame, United States of America. (2023 - 2023).
  • DeMars, C.M. (Author), Ward , S.J. (Author & Presenter), POSMOL 2023 (XXI International Workshop on Low-Energy Positron and Positronium Physics and XXIII International Symposium on Electron-Molecule Collisions and Swarms), Positron-Helium Elastic Scattering using a One-Electron Model Helium Potential, University of Notre Dame, United States of America. (2023 - 2023).
  • Ward Quintanilla, S.J. (Author & Presenter), Mitchell, W. (Author), DAMOP 2024, Photodetachment of the Positronium Negative Ion (Ps$^-$) and the $^1$D-wave e--Ps scattering, Spokane, Washington, United States of America. (2023 - 2023).
  • Quintanilla, S.J. (Author & Presenter), Mitchell, W. (Author), 75th Annual Gaseous Electronics Conference, 2022, The Ps$^-$ ion and e$^-$-Ps Scattering, APS, Sendai, Japan, Japan. (2022 - 2022).
  • DeMars, C.M. (Author), Ward, S.J. (Author & Presenter), Van Reeth, P. (Author), 19th International Conference on Positron Annihilation (Online Conference), Comparison of positron and electron elastic scattering from helium, Hosted by the Helsinki Accelerator Laboratory. International Conference on Positron Annihilation (ICPA)., Virtual. Online., Finland. (2022 - 2022).
  • Mitchell, W. (Author & Presenter), Ward , S.J. (Author & Presenter), 19th International Conference on Positron Annihilation (Online Conference), Electron-Ps Elastic Scattering and the Photodetachment of Ps$^-$, Hosted by the Helsinki Accelerator Laboratory. International Conference on Positron Annihilation (ICPA)., Virtual. Online., Finland. (2022 - 2022).
  • Quintanilla, S.J. (Author & Presenter), Mitchell, W.J. (Author), 53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics (DAMOP), 1,3S and 1,3P electron-positronium scattering, APS, Orlando, Florida, United States of America. (2022 - 2022).
  • DeMars, C.M. (Author & Presenter), Claypool, J. (Author), Ward Quintanilla, S.J. (Author & Presenter), Van Reeth, P. (Author), 52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics, Comparison of elastic scattering of electron, positron and positronium from helium, APS Division of Atomic, Molecular and Optical Physics, Virtual, United States of America. (2021 - 2021).
  • Mitchell, W.J. (Author & Presenter), Ward Quintanilla, S.J. (Author & Presenter), 74th Annual Gaseous Electronics Conference, Singlet p-wave elastic electron-positronium scattering, GEC, Affiliated to GEC, Virtual, United States of America. (2021 - 2021).
  • DeMars, C.M. (Author & Presenter), Ward Quintanilla, S.J. (Author & Presenter), Van Reeth, P. (Author), Claypool, J. (Author), 74th Annual Gaseous Electronics Conference, Comparison of phase shifts and cross sections as a function of velocity for positron, electron and positronium elastic scattering from helium, GEC, Affiliated with APS, Virtual, United States of America. (2021 - 2021).
  • DeMars, C.M. (Author & Presenter), Ward, S.J. (Author & Presenter), Kent, J.B. (Author), 73rd Annual Gaseous Electronics Virtual Conference, Deep minima in the Coulomb-Born triply differential cross section for electron and positron ionization of hydrogen and helium, GEC, Affiliated with APS, Virtual, United States of America. (2020 - 2020).
  • DeMars, C.M. (Author & Presenter), Ward, S.J. (Author & Presenter), Kent, J.B. (Author), 51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics, Deep minima in the Coulomb-Born triply differential cross section for electron and positron ionization of hydrogen and helium, APS, Virtual, United States of America. (2020 - 2020).
  • Ward, S.J. (Author & Presenter), Alrowaily, A.W. (Author & Presenter), Van Reeth, P. (Author), 51st Annual Meeting of the APS Division of Atomic,, Molecular and Optical Physics, Deep minimum in the Ps-formation differential cross section for positron-helium collisions in the Ore gap, APS, Virtual, United States of America. (2020 - 2020).
  • Medrano, G. (Author), Ward , S.J. (Author & Presenter), Van Reeth, P. (Author), XX International Workshop on Low-Energy Positron and Positronium Physics, Calculations of the Ps_2 Bound-State, Belgrade, Serbia, Serbia. (2019 - 2019).
  • Alrowaily, A.W. (Author), Ward, S.J. (Author & Presenter), Van Reeth, P. (Author), XX International Workshop on Low-Energy Positron and Positronium Physics, Deep Minima and Vortices for Positronium Formation in Positron-Hydrogen Collisions, Belgrade, Serbia, Serbia. (2019 - 2019).
  • DeMars, C.M. (Author), Ward , S.J. (Author & Presenter), XX International Workshop on Low-Energy Positron and Positronium Physics, Deep Minima in the TDCS for Positron-Helium Ionization Computed Using the Coulomb-Born Approximation, Belgrade, Serbia, Serbia. (2019 - 2019).
  • DeMars, C.M. (Author & Presenter), Kent, J.B. (Author), Ward , S.J. (Author & Presenter), 50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting DAMOP, Deep minimum in the Coulomb-Born TDCS for e$^-$-He and e$^+$-He ionization, Milwaukee, WI., USA, United States of America. (2019 - 2019).
  • Ward, S.J. (Author & Presenter), Alrowaily, A.W. (Author & Presenter), Van Reeth, P. (Author), 50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting DAMOP, Multichannel Effective Range Theory Analysis of Zeros in the Positronium formation Scattering Amplitude for Positron-Hydrogen Collisions, Milwaukee, WI, USA, United States of America. (2019 - 2019).
  • Medrano, G.J. (Author & Presenter), Ward , S.J. (Author & Presenter), Van Reeth, P.J. (Author), 50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting DAMOP, Variational Calculations of the Ps-Ps System, Milwaukee, WI., United States of America. (2019 - 2019).
  • Medrano, G. (Author & Presenter), Ward, S.J. (Author & Presenter), Van Reeth, P. (Author), 25th International Conference on the Application of Accelerators in Research and Industry (CAARI 2018), Variational Calculations for the Ps-Ps System, Gaylord Texan Resort in Grapevine, Texas USA, United States of America. (2018 - 2018).
  • Ward, S.J. (Author & Presenter), Alrowaily, A.W. (Author & Presenter), Reeth, P.V. (Author), 49th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting, Vortices for Ps formation in positron-hydrogen collisions in the Ore gap, American Physics Society, Ft. Lauderdale, FL, United States of America. (2018 - 2018).
  • Ward, S.J. (Author & Presenter), Alrowaily, A.W. (Author), Van Reeth, P. (Author), 71st Annual Gaseous Electronic Conference (GEC) Meeting of the American Physical Society, (Co-Located with the 60th Annual meeting of the APS Division of Plasma Physics), Ring Vortices for Positronium formation in Positron-Hydrogen Collisions in the Ore Gap, Oregon Convention Center, Portland, Oregon, United States of America. (2018 - 2018).
  • Ward, S.J. (Author & Presenter), Van Reeth, P. (Author), Alrowaily, A.W. (Author), 48th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics, Vortices for Ps formation in positron-hydrogen collisions, APS, Sacramento, California, United States of America. (2017 - 2017).
  • Ward, S.J. (Author & Presenter), Kent, J.B. (Author), 70th Annual Gaseous Electronics Conference, Nov. 6-10, 2017, Pennsylvania, Pittsburg, United States of America. (2017 - 2017).
  • Van Reeth, P. (Author & Presenter), Alrowaily, A.W. (Author), Ward, S.J. (Author), Hiley, B.J. (Author), EmQM17 Emergent Quantum Mechanics, Vortices in low-energy positron-hydrogen collisions, University of London, United Kingdom. (2017 - 2017).
  • Kent, J.B. (Author & Presenter), Ward Quintanilla, S.J. (Author), Physics department Senior Thesis undergraduate student poster presentations, Vortex for Hydrogen ionization by Electron Impact, Physics Department, UNT, Physics Department, UNT, United States of America. (2017).

Contracts, Grants, Sponsored Research

    Grant - Research

  • Ward, S.J., "Low-energy atomic processes including ones involving a positron," sponsored by National Science Foundation, Federal, $100000 Funded. (2022 - 2025).
  • Ward (Quintanilla), S.J. (Principal), "Theoretical Investigation of Low-Energy Positron and Positronium Collisions," sponsored by National Science Foundation, Federal, $90992 Funded. (2017 - 2021).
  • Ward Quintanilla, S., "Positronium-positronium scattering," sponsored by Physics Department, University of North Texas, University of North Texas, $3469.02 Funded. (2017 - 2017).
  • Quintanilla, S.J. (Principal), "Theoretical Investigation of Low-Energy Positron and Positronium Collisions," sponsored by National Science Foundation, FED, Funded. (2017 - 2021).

Service

University Service

  • Faculty Mentor, Mentor for Physics Faculty Dr. Jens Neu. (2023 - Present).
  • Committee Member, Executive Committee. (July 2023 - 2025).
  • Committee Member, Personnel Committee part of the Executative Committee. (July 2023 - 2025).
  • Committee Member, Promotion Review Committee. (March 2023 - 2023).
  • Committee Member, Graduate Committee. (July 2022 - 2023).
  • Committee Member, Search Committee for Condensed Matter Physicist. (2022 - 2023).
  • Committee Member, Search Committee for Lecturer. (2021 - 2022).
  • Committee Member, Executive Committee. (July 2020 - June 2022).
  • Other (Helped with Physics Ph.D. Qualifer Exams), Helped with Physics Ph.D. Qualifer Exams. (2020 - 2020).
  • Committee Member, Search Committee for Astrophysicist. (2019 - 2020).
  • Member, Graduate Committee. (2015 - 2019).
  • Member, Departmental Doctoral Committee. (2015 - 2015).
  • Member, Undergraduate Committee. (2014 - 2015).
  • Member, Departmental Doctoral Committee. (2014 - 2014).
  • Other (Member and Chair. Chair 2009-2011, Chair Oct. 2012-Present), Departmental Doctoral Examination Committee. (2009 - 2013).
  • Other (Member and Chair. Chair 2011-2012), Departmental Personnel Committee. (2010 - 2012).
  • Other (Affiliated to the committee), Affiliated to the Search Committee for Materials Modeling Research Cluster. (2010 - 2011).
  • Member, Search committee for senior hire in Ion Beam Accelerator Laboratory. (2010 - 2011).
  • Member, High-Performance Computing Advisory Committee. (2009 - 2010).
  • Member, Hign-Performance Computing Committee. (2008 - 2009).
  • Other, Search Committee for Condensed Matter Theorist. (2008 - 2009).
  • Committee Chair, Grievance Committee. (2008 - 2008).
  • Other, High-Performance Computing Committee. (2008 - 2008).
  • Other, Undergraduate Committee. (2004 - 2006).
  • Other, Doctoral Examination Committee. (2003 - 2004).
  • Other, Personnel Committee. (2003 - 2004).
  • Committee Chair, Doctoral Examination Committee. (2002 - 2003).
  • Other, Graduate Committee. (2001 - 2002).
  • Other, Revision of Physics Charter Committee. (2001 - 2002).
  • Other, Search Committee. (2000 - 2002).
  • Committee Chair, Personnel Committee. (1999 - 2001).
  • Other, Executive Committee. (1997 - 1998).
  • Other, Search Committee. (1997 - 1998).
  • Committee Chair, Graduate Committee. (1995 - 1998).
  • Other, Fall Colloquium Coordinator. (1997 - 1997).
  • Other, Search Committee. (1996 - 1997).
  • Other, Departmental Examination Committee. (1993 - 1997).
  • Other, Election Judge. (1994 - 1995).
  • Other, Rhodes/Marshall Faculty Screening Committee. (1994 - 1995).
  • Other, Assistant Election Judge. (1993 - 1994).
  • Other, Computational Physics Laboratory Committee. (1992 - 1994).
  • Other, Physical Facilities Committee. (1991 - 1993).

Public Service

  • Chairperson (Dr. Rebekah Purvis and myself (Sandra J. Quintanilla) are the faculty advisors.), UNT Physics Olympics Committee for the 2024 UNT Physics Olympics. Denton, Texas. (2023 - 2024).
  • Other (Dr. Rebekah Purvis and I (Sandra J. Quintanilla) co-organized the 2023 UNT Physics Olympics.), Faculty Co-organizers of the 2023 Physics Olympics at UNT.. Denton, Texas. (2022 - 2023).
  • Other (Brought in Discharge Lamps from UNT to Chemistry teacher at Denton Calvary Academy.), Denton Calvary Academy. Denton, Texas. (November 2019 - November 2019).
  • Other (Science Fair co-coordinator), Woodrow Wilson Elementary School. Denton, Texas. (2014 - 2015).
  • Other (Science Fair co-coordinator), Woodrow Wilson Elementary School. Denton, (2013 - 2014).

Professional Service

  • Reviewer, Journal Article, Journal Atoms. (2020 - Present).
  • Reviewer, Journal Article, European Physical Journal D. Insitute of Physics.. (2017 - Present).
  • Reviewer, Journal Article, Journal of Physics B. Insitute of Physics.. (2017 - Present).
  • Reviewer, Journal Article, Physical Review A. American Physical Society. (2017 - Present).
  • Committee Member, Executive Committee of Topical Group on Few-Body Systems & Multiparticle Dynamics of the American Physical Society GFB APS. (June 2022 - May 2025).
  • Committee Member, GEC-IOPS committee. (November 2022 - October 2024).
  • Committee Member, Nominating Committee of the APS GFB, January 2023. (January 2023 - 2023).
  • Session Chair, APS. Ann Arbor, Michigan. (October 9, 2023 - October 9, 2023).
  • Committee Member, Executive Committee of the Gaseous Electronics Conference. (2020 - October 2022).
  • Committee Member, General Committee of the Gaseous Electronics Conference. (2020 - October 2022).
  • Member, An National Science Foundation Panel. (2020 - 2020).
  • Chairperson, GEC. College Station, Texas. (October 30, 2019 - October 30, 2019).
  • Committee Member, GEC. College Station, Texas. (October 29, 2019 - October 30, 2019).
  • Other, University of North Texas. Denton, TX. (2017 - 2018).
  • Reviewer, Journal Article, Nature Communications. (2017 - 2017).
  • Other (Wrote letter for another faculty member at a different university for a research award.), University. (2017 - 2017).
  • Other (Invited Dr. Doerte Blume to give colloquium), Invited Dr. Doerte Blume to give colloquium. Denton, Texas. (November 28, 2017 - November 28, 2017).
  • Session Chair, 70th Annual Gaseous Electronics Conference. Pittsburgh, Pennsyvania. (November 9, 2017 - November 9, 2017).
  • Member, International advisory committee for the XIV international workshop on ``Low Energy Positron and Positronium Physics. (2011 - 2011).
  • Other, Member of the Executive Committee of the Few-Body Topical Group of the American Physical Society (APS). (2008 - 2011).
  • Member, International advisory committee for the XIV international workshop on ``Low Energy Positron and Positronium Physics". (2009 - 2009).
  • Other, International advisory committee for the XV international workshop on"Low Energy Positron and Positronium Physics",York University. Toronto, (2009 - 2009).
  • Other, International advisory committee for the XIV international workshop on"Low Energy Positron and Positronium Physics", Reading University. (2007 - 2007).
  • Other, Assistant Election Judge. (2004 - 2006).
  • Other, International advisory committee for the XIII international workshop on"Low Energy Positron and Positronium Physics". Campinas, SP. (2005 - 2005).
  • Other, International advisory committee for the XII international workshop on"Positron and Positronium Physics". Sandberg, (2003 - 2003).
  • Other (Chaired a session), The XXI International Workshop "Positron and Positronium Physics". Sandberg, (2003 - 2003).
  • Other, International advisory committee for the XI international workshop on "Low Energy Positron and Positronium Physics". Santa Fe, New Mexico. (2001 - 2001).
  • Other (Panel member), For the session"Positron and Positronium on Atoms" at the workshop "Positron and Positronium Interactions: New Directions", ITAMP. (2000 - 2000).
  • Other, International advisory committee for the workshop on Low-Energy Positron and Positronium Physics Satellite Meeting to XXI ICPEAC. Sendai, (1999 - 1999).
  • Other (Chaired a session), Annual Meeting of the Texas Section of the American Physical Society. (1991 - 1991).