Triple-center treatment of electron transfer and ionization in He/sup 2 +/-H and p-He/sup +/ collisions

Journal Article · Wed Jun 15 04:00:00 EDT 1988 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.37.4656· OSTI ID:5228550

Winter, T G

Cross sections have been calculated for electron transfer into the 2s, 2p/sub 0/, 2p/sub 1/, and all states of He/sup +/, and for ionization, in collisions between /sup 4/He/sup 2 +/ ions and H(1s) atoms. Cross sections have also been calculated for electron transfer into the ground state and all states of H, and for ionization, in collisions between protons and /sup 4/He/sup +/(1s) ions. The center-of-mass collision energies range from 1.6 to 40 keV. A coupled-state approach is taken using large triple-center bases of up to 34 states centered on the two nuclei and a third center chosen to be the equiforce point (saddle point of the potential) between the nuclei. The sensitivity of the cross sections to the size of basis is studied, and the ionization cross sections are found to be the more sensitive, particularly at lower energies. The electron-transfer cross sections in most cases are found to agree extremely well with larger-basis molecular-state results at generally lower energies and with double-center pseudostate results at higher energies, as well as with experimental results. The more sensitive ionization cross sections follow the trend of the experimental data, suggesting the considerable importance of saddle-point electrons as previously observed for p-H collisions.

• Research Organization: Department of Physics, Pennsylvania State University, Wilkes-Barre Campus, Lehman, Pennsylvania 18627
• OSTI ID: 5228550
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 37:12; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELEMENTS
ENERGY DEPENDENCE
HELIUM IONS
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
ION-ATOM COLLISIONS
ION-ION COLLISIONS
IONIZATION
IONS
NONMETALS