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