Differential cross sections for state-selective electron capture in 25–100-keV proton-helium collisions
- 1 July 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 46 (1), 275-283
- https://doi.org/10.1103/physreva.46.275
Abstract
Cross sections differential in the scattering angle of the projectile are presented for electron capture summed over all states and to the 2s, 2p, 3s, 3p, 4s, and 4p states of hydrogen in 25-, 50-, and 100-keV proton-helium collisions. The classical-trajectory Monte Carlo (CTMC) technique was employed for these calculations as well as to compute total cross sections as a function of impact energy. The latter are compared with experiment to display the behavior of the integral state-selective cross sections in this energy regime. Detailed comparison is also made between the calculated angular differential cross sections and the experimental measurements of Martin et al. [Phys. Rev. A 23, 285 (1981)] for capture summed over all states and of Seely et al. [Phys. Rev. A 45, R1287 (1992)] for capture to the 2p state. Very good overall agreement is found. Regarding the cross section for capture summed over all states, an improved agreement is demonstrated by using an alternate representation of the initial state in the CTMC method, which improves the electronic radial distribution but which cannot presently be applied to state-selective determinations.Keywords
This publication has 45 references indexed in Scilit:
- Measurement of electron-transfer cross sections for H(3l) in intermediate-energy-He collisionsPhysical Review A, 1991
- Impact-parameter treatment of classical trajectory Monte Carlo calculations for ion-atom collisionsPhysical Review A, 1989
- Three-body interactions in proton-helium angular scatteringPhysical Review Letters, 1989
- Cross sections for electron capture by neutral and charged particles in collisions with HeAtomic Data and Nuclear Data Tables, 1989
- n, lDistributions for Electron-Capture from H(1s) by C6+and O8+Physica Scripta, 1989
- Electron capture at very small scattering angles from atomic hydrogen by 25-125-keV protonsPhysical Review A, 1981
- Roothaan-Hartree-Fock atomic wavefunctions: Basis functions and their coefficients for ground and certain excited states of neutral and ionized atoms, Z≤54Atomic Data and Nuclear Data Tables, 1974
- Formation of Fast Excited H Atoms. I. Charge-Transfer Neutralization ofin He and ArPhysical Review A, 1972
- Electron Capture into theState of H by FastImpact on GasesPhysical Review B, 1967
- Electron Capture into theState of Hydrogen by Fast-Proton Impact on GasesPhysical Review B, 1966