Plane-wave-factor, molecular-state treatment of electron transfer in collisions of He/sup 2 +/ ions with H atoms

Journal Article · Sat Mar 01 04:00:00 EST 1980 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.21.793· OSTI ID:5661076

Winter, T G; Hatton, G J

Total cross sections are reported for electron transfer into the individual states 2s, 2p/sub 0/, and 2p/sub 1/, and into all bound states of He/sup +/ in collisions of 1- to 70-keV /sup 4/He/sup 2 +/ ions with H atoms. Following Bates and McCarroll, plane-wave factors have been fully incorporated in a coupled-molecular-state approximation. All velocity-dependent matrix elements have been evaluated as power series in the nuclear velocity. The bases used include up to 10 states 1ssigma, 2ssigma, ..., 3ddelta of the frozen HeH/sup 2 +/ molecule. Convergence of cross sections with respect to the size of the bound-state basis was studied: fewer basis functions are needed than when plane-wave factors are omitted. To test the convergence of the latter results with respect to the size of the bound-state basis, the two potentially important states 5gsigma and 5g..pi.. have been added to the previously used 20-state (1ssigma, 2ssigma, ..., 4fphi) basis, and were found to affect the cross section for transfer into all states by at most 6%. For transfer into all states, results with and without plane-wave factors converge at low energies, agreeing to within 5% at 1 keV. The agreement of the plane-wave-factor results with the experimental data for transfer into all states is excellent at /sup 4/He/sup 2 +/ energies down to 8 keV, but poor at the lower energies, where the coupled-state results are believed to be more fully converged. For capture into the 2s state, the plane-wave-factor results lie above the upper bound of the experimental values by 25% at 20 keV.

• Research Organization: Physics Department, Pennsylvania State University, Wilkes-Barre Campus, Wilkes-Barre, Pennsylvania 18708
• OSTI ID: 5661076
• Journal Information: Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 21:3; 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
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
CRYOGENIC FLUIDS
ELECTRON EXCHANGE
ELECTRON TRANSFER
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EV RANGE 10-100
FLUIDS
HELIUM IONS
HYDROGEN
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
MOLECULAR IONS
NONMETALS
TOTAL CROSS SECTIONS