Ionization in collisions between (200-2000)-keV protons and He+(1s, 2s, or 3s) ions studied using a Sturmian basis
Abstract
Cross sections have been determined for ionization as well as stripping in collisions between protons and He+ ions in the 1s, 2s, or 3s state for proton energies from 200 keV to 2 MeV using the coupled-Sturmian-pseudostate approach. Detailed convergence studies are presented. For comparison, and to include neglected higher partial waves, first Born cross sections are also reported. By using a larger basis, this work extends earlier calculations that were limited to the 1s initial state [T. G. Winter and S. G. Alston, Phys. Rev. A 45, 1562 (1992)]. Further, a correction has been applied to the uneven distribution of Sturmian-generated energies at the ionization threshold, yielding cross sections much more stable with respect to basis size.
- Publication:
-
Physical Review A
- Pub Date:
- May 2000
- DOI:
- 10.1103/PhysRevA.61.052709
- Bibcode:
- 2000PhRvA..61e2709W
- Keywords:
-
- 34.50.Fa;
- Electronic excitation and ionization of atoms