Charge Transfer, Ionization, and Excitation in Collisions between Protons and the Ions He$^+$, Li$^{2+}$. Be$^{3+}$, B$^{4+}$, and C$^{5+}$
POSTER
Abstract
Coupled-state cross sections are being determined for electron transfer, ionization, and excitation in collisions between keV- to MeV-energy protons and the hydrogenic ions He$^+$, Li$^{2+}$, Be$^{3+}$, B$^{4+}$, and C$^{5+}$, extending work reported 25 years ago with a limited basis for electron transfer and ionization only, over a limited energy range below the peak in the ionization cross section.\footnote{T. G. Winter, Phys. Rev. A {\bf 35}, 3799 (1987).}; the first and last processes [with the ions He$^+$ and C$^{5+}$] were also considered in related studies.\footnote{T. G. Winter and J. R. Winter, Phys. Rev. A {\bf 61}, 052709 (2000).}$^,$\footnote{T. G. Winter, Phys. Rev. A {\bf 69}, 042711 (2004)).} The presently used one- and two-center Sturmian bases are similar to those in the recent large-basis calculations for antiproton-H($1s$) atom collisions.\footnote{T. G. Winter, Phys. Rev. A {\bf 83}, 022709 (2011).}. Detailed convergence studies are being carried out, and scaling rules with nuclear charge are being re-examined, as are connections with perturbative results for all three processes, including Born cross sections for excitation into individual lower excited states.
Authors
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Thomas Winter
Penn State U., Wilkes-Barre Campus