Dr. Sandra J. Quintanilla
University of North Texas
Physics
(940) 565-4739
Email:

Education

PhD, University of London, 1986.
Major: Physics
Dissertation Title: 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

Academic - Post-Secondary
Professor(Tenured), University of North Texas Denton, Texas. (2007 – Present).
Dr./Professor (Tenured)/Faculty Development Leave, University of North Texas. (January 2018 – May 2018).

Professional Memberships

Member, 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).

Executive committee member, Topical Group on Few-Body Systems. (2008 – 2011).

Previously board member, Topical Group on Few-Body Systems and Multi-particle Dy¬namics of the APS. (1989 – 1990).

Development Activities Attended

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

Awards and Honors

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 – 2001).

Selectedforappointment asaLongTerm Visitor, Smithsonian Astro¬physical Observatory's Institute for TheoreticalAtomic and Molecular Physics. (1999 – 1999).

Who's Who in Science and Engineering, 4th Edition. (1998 – 1999).

Selectedforappointment asa ShortTerm Visitor, Smithsonian Astro¬physical Observatory's Institute for TheoreticalAtomic and Molecular Physics. (1997 – 1997).

Who's Who Among America'sTeachers. (1996 – 1996).

Valerie Myserscough Prize, Universityof London. (1985 – 1985).

Valerie Myserscough Prize, Universityof London. (1984 – 1984).

Teaching

Teaching Experience

University of North Texas
PHYS 3310, Mathematical Methods in the Physical Sciences, 20 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, 4 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, 23 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 – Present).

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 – Present).

Supervised Research,"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, Physics. (2016 – 2017).

Other,"On Ph.D. dissertation committee," Physics. (2016).

Other,"Not. Project/Thesis/Dissertation.," Physics. (2015 – 2016).

Supervised Research, 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 – May 2019).

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
Ward, S. J., Woods, D., Van Reeth, P. (2015). An Investigation of Positronium-Hydrogen Collisions. 60(7), 182-183. http://meetings.aps.org/link/BAPS.2015.DAMOP.Q1.112
Quintanilla, S. J. (2014). http://meetings.aps.org/link/BAPS.2014.DAMOP.Q1.37
Quintanilla, S. J. (2014). http://meetings.aps.org/link/BAPS.2014.GEC.MW1.7
Quintanilla, S. J. (2014). http://meetings.aps.org/link/BAPS.2014.DAMOP.Q1.55
Quintanilla, S. J. (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
Quintanilla, S. J. (2013). Positron Collisions from Simple Atoms and Positronium-Hydrogen Collisions. http://meetings.aps.org/link/BAPS.2013.GEC.KW5.1
Quintanilla, S. J. (2013). Variational Calculations of Low-Energy Elastic Ps-H Scattering. http://meetings.aps.org/link/BAPS.2013.DAMOP.Q1.122
Quintanilla, S. J. (2012). Low-energy S- and P-wave Positronium-Hydrogen Collisions.
Quintanilla, S. J. (2011). Hyperspherical hidden crossing calculation of Ps formation in low-energy e^+-Na collisions.
Quintanilla, S. J. (2011). Low-Energy S-Wave Positronium-Hydrogen Collisions.
Quintanilla, S. J. (2011). Vortices in Coulomb-Born calculations for inner-shell ionization of carbon by electron-impact.
Quintanilla, S. J. (2010). Binding Energy and Geometry of e^+Na.
Quintanilla, S. J. (2010). The Binding Energy of PsH.
Quintanilla, S. J. (2009). Binding Energy Calculations for e^+Li and e^+Na.
Quintanilla, S. J. (1997). "The Hidden Crossing Method Applied toPositroniumFormation".
Quintanilla, S. J. (1993). "RecentDevelopmentsinthe TheoryofPositron-Hydrogen Collisions".
Quintanilla, S. J. (1990). "Positron-AlkaliAtom Scattering".
Quintanilla, S. J. (1990). "Resonances inPositron-Alkali Close-Coupling Calculations".
Quintanilla, S. J. (1990). "Theoretical Calculations of Positron Collisions with Atoms".
Quintanilla, S. J. (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/
Quintanilla, S. J. (2010). Binding Energy and Structure of e^+Na,.
Quintanilla, S. J. (2009). "Absolute Cross Section for Positron-Impact Ionization of Hydrogen Near Threshold".
Quintanilla, S. J. (2008). "Near-ThresholdPositron Impact Ionization of Hydrogen".
Quintanilla, S. J. (2007). "Optimizing the Paths for Including the Correction Term to the Hyperspherical Hidden Crossing Method: Application to Formationine+ -Li Collisions".
Quintanilla, S. J. (2007). "The Photodetachmentof Ps− and Low-Energye+ -H Collisions".
Quintanilla, S. J. (2006). "Binding Energy and Structure of e+ Li and e− Li using a Parametric Model Potential".
Quintanilla, S. J. (2005). "PositroniumFormation Cross Section forPositron-Lithium Collisions".
Quintanilla, S. J. (2004). "E ff ect of the Core Polarization Term on Ps Formation in Low-Energy e+ -Li Collisions".
Quintanilla, S. J. (2004). "E ff ectofPolarizationon Photodetachment Thresholds".
Quintanilla, S. J. (2003). "ApplicationoftheHyperspherical Hidden Crossing MethodtoPositron-Lithium Collisions".
Quintanilla, S. J. (2002). "Positronium Formation in Low-Energy Positron Collisions with One-and Two-Electron Atoms".
Quintanilla, S. J. (2002). "The E ff ect of thePolarizationPotential on Low-EnergyAtomic Processes".
Quintanilla, S. J. (2000). "E ff ective Range Analysis of Positron-Hydrogen Collisions".
Quintanilla, S. J. (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
Quintanilla, S. J. (2008). "Absolute Cross Section forPositron Impact Ionization of Hydrogen Near Threshold".
Quintanilla, S. J. (2007). "Near ThresholdPositron Impact Ionization of Hydrogen".
Quintanilla, S. J. (2003). "The Application of the Hyperspherical Hidden Crossing Method toPositroniumFormation inPositron-Lithium Scattering".
Quintanilla, S. J. (2002). "Hyperspherical Hidden Crossing CalculationofPositron-Lithium Collisions".
Quintanilla, S. J. (2002). "Photodetachment of Alkali Negative Ions".
Quintanilla, S. J. (2001). "E ff ective Range Theory Analysis ofPositron-Helium Collisions".
Quintanilla, S. J. (2000). "Virtual State of thePositronium-Proton System".
Quintanilla, S. J. (1999). "Analysis of Positron-Hydrogen Collisions using an E ff ective Range Theory".
Quintanilla, S. J. (1998). "Hidden Crossing Method AppliedtoPositroniumFormation".
Quintanilla, S. J. (1998). "Hidden Crossing Theory Applied to Ps-formation inPositron-Hydrogen Collisions".
Quintanilla, S. J. (1997). "Anti-Capture to the Continuum via a Double Collision Mechanism in (e,2e) Collisions".
Quintanilla, S. J. (1997). "The Hidden Crossing Method Applied toPositroniumFormation".
Quintanilla, S. J. (1996). "The Hidden Crossing Method Applied to Positronium Formation".
Quintanilla, S. J. (1995). "Recent Developmentin the TheoryofFastPositron-Atom Collisions".
Quintanilla, S. J. (1994). "PositroniumFormationbyElectronic Capture from Hydrogenic Ions".
Quintanilla, S. J. (1994). "Single and Double Photoionizationof Helium".
Quintanilla, S. J. (1994). "WaveFunctionsforContinuum Statesof ChargedFragments".
Quintanilla, S. J. (1991). "A Variational Principle for Time-Dependent Interactions".
Quintanilla, S. J. (1989). "Close-Coupling ApproachtoPositron Scattering for Lithium, Sodium andPotassium".
Quintanilla, S. J. (1989). "Close-Coupling CalculationsofLow-EnergyPositron-Alkali Collisions".
Quintanilla, S. J. (1989). "ResonancesinLow-EnergyPositron ScatteringfromLi,NaandK".
Quintanilla, S. J. (1988). "Close-coupling ApproachtoPositron Scattering fromPotassium".
Quintanilla, S. J. (1988). "Theoretical StudiesofLow-EnergyPositron-AlkaliAtom Scattering".
Quintanilla, S. J. (1987). "Elastic Scattering of Electrons (or Positrons) from Positronium and the Photodetachment of the Positronium Negative Ion".
Quintanilla, S. J. (1986). "The Photodetachment of the Negative Ion ofPositronium (Ps−)".
Quintanilla, S. J. (1985). "The ScatteringofLow-Energy S-Wave ElectronsbyPositronium".

Presentations Given

Colloquium

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).

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).

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).

Seminar

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).

Contracts, Grants and Sponsored Research

Grant - Research
Ward, S. J., "Low-energy atomic processes including ones involving a positron," Sponsored by National Science Foundation, Federal, $100000 Funded. (September 1, 2022 – August 31, 2025).
Ward (Quintanilla), S. J. (Principal), "Theoretical Investigation of Low-Energy Positron and Positronium Collisions," Sponsored by National Science Foundation, Federal, $90992 Funded. (September 1, 2017 – August 31, 2021).
Ward Quintanilla, S., "Positronium-positronium scattering," Sponsored by Physics Department, University of North Texas, University of North Texas, $3469.02 Funded. (2017 – 2017).
Uncategorized
Quintanilla, S. J. (Principal), "Positron and Positronium Collisions with Simple Atoms," Sponsored by National Science Foundation, $164516. (2010 – 2014).
Quintanilla, S. J. (Principal), "Collaborative research: Hyperspherical hidden crossing method applied to positron-alkali," Sponsored by National Scienec Foundation, $151590. (2004 – 2008).
Quintanilla, S. J. (Co-Principal), "Application of the Hyperspherical Hidden Crossing Method to Low-Energy Positron Collisions with the Alkali and Hydrogen Atoms," Sponsored by Faculty Research Grant, $1500. (2003 – 2004).
Quintanilla, S. J. (Co-Principal), "Low-Energy and Near-Threshold Positron Collisions," Sponsored by Faculty Research Grant, $4500. (2002 – 2003).
Quintanilla, S. J. (Co-Principal), "Near-Threshold Photodetachment," Sponsored by Faculty Research Grant, $750. (2002 – 2002).
Quintanilla, S. J. (Co-Principal), "Near-Threshold Behavior of Atomic Processes," Sponsored by Faculty Research Grant, $4000. (2001 – 2002).
Quintanilla, S. J. (Co-Principal), "Low-Energy Positron Collisions," Sponsored by Faculty Research Grant, $5000. (2000 – 2001).
Quintanilla, S. J. (Co-Principal), "Probing the three-body," Sponsored by National PI: S. J. Ward, $60000. (1998 – 2000).
Quintanilla, S. J. (Co-Principal), "Probing the Three-Body Coulomb system via Positronium Formation in Positron-Hydrogen Collisions," Sponsored by Faculty Research Grant, $3500. (1998 – 1999).
Quintanilla, S. J. (Co-Principal), "Low-Energy Positron-Hydrogen Ionization," Sponsored by Faculty Research Grant, $5000. (1997 – 1998).
Quintanilla, S. J. (Co-Principal), "Positronium Formation—A Three Body Coulomb Problem," Sponsored by Faculty Research Grant, $3800. (1996 – 1997).
Quintanilla, S. J. (Co-Principal), "Positronium Formation at Low and High Energies," Sponsored by Faculty Research Grant, $2500. (1995 – 1996).
Quintanilla, S. J. (Co-Principal), "Single and Double Photoionization of Helium," Sponsored by Faculty Research Grant, $2700. (1994 – 1995).
Quintanilla, S. J. (Co-Principal), "Positron ionization," Sponsored by National PI:S.J. Ward, $66000. (1992 – 1995).
Quintanilla, S. J. (Co-Principal), "Theoretical Study of Electron-Impact Ionization," Sponsored by Faculty Research Grant, $2500. (1993 – 1994).
Quintanilla, S. J. (Other), "JuniorFacultyResearchGrant," Sponsored by Faculty Research Grant. (1991 – 1992).
Quintanilla, S. J. (Co-Principal), "Positron Impact Ionization and Positronium Formation at High Energies," Sponsored by Faculty Research Grant, $3000. (1991 – 1992).

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. (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, Departmental Doctoral Examination Committee. (2009 – 2013).

Other, Departmental Personnel Committee. (2010 – 2012).

Other, 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).

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, University. (2017 – 2017).

Other, 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, 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, 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, Annual Meeting of the Texas Section of the American Physical Society. (1991 – 1991).

Public Service

Chairperson, UNT Physics Olympics Committee for the 2024 UNT Physics Olympics, Denton, Texas. (2023 – 2024).

Other, Faculty Co-organizers of the 2023 Physics Olympics at UNT., Denton, Texas. (2022 – 2023).

Other, Denton Calvary Academy, Denton, Texas. (November 2019 – November 2019).

Other, Woodrow Wilson Elementary School, Denton, Texas. (2014 – 2015).

Other, Woodrow Wilson Elementary School, Denton. (2013 – 2014).