Molecular-state study of He/sup 2 +/-H(1s) and H/sup +/-He/sup +/(1s) collisions

Journal Article · Tue Dec 01 04:00:00 EST 1981 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.24.3019· OSTI ID:5970803

Kimura, M; Thorson, W R

We have computed direct and charge-exchange excitation cross sections for (a) He/sup 2 +/-H(1s) collisions at projectile energies 1--20 keV, and for (b) H/sup +/-He/sup +/(1s) collisions at c.m. energies 1.6 to 8 keV, using the close-coupling method with HeH/sup 2 +/ molecular states as basis and electron translation-factor corrections based on molecular-state switching functions. Basis sets with up to 10 and 12 molecular states have been used, and good convergence of results as a function of basis size is found. The results are compared with recent theoretical calculations of Winter, Lane, and Hatton and with experimental values. For process (a), total charge-transfer cross sections are in generally good agreement with those found by Winter et al. using Bates--McCarroll translation factors and, less quantitatively, so are individual state cross sections for He/sup +/(2s, 2p/sub 0/, 2p/sub plus-or-minus1/). For process (b), significant differences with the results of Winter et al. are found; these appear to be traceable to the different treatments of the electron translational factors used. Charged-transfer cross sections of Winter and Hatton (Phys. Rev. A 22, 930 (1980)) are 14 --32% higher than those found here using comparable basis sets, and individual state cross sections for direct excitation to He/sup +/(2s, 2p/sub 0/, 2p/sub plus-or-minus1/) are also systematically larger than ours (by as much as a factor of 2 in some cases) although values for individual states are only poorly converged in both calculations. Very good agreement is found in all cases with recent experimental measurements.

• Research Organization: Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
• OSTI ID: 5970803
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 24:6; 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
DATA
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
HELIUM IONS
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
ION-ION COLLISIONS
IONS
NONMETALS
NUMERICAL DATA
THEORETICAL DATA