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Excitation and charge transfer to 2s and 2p states in 1--20-keV H/sup +/-H collisions

Journal Article · · Phys. Rev. A; (United States)
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Electron excitation and transfer to 2s and 2p states in H/sup +/-H 1s collisions is studied in the energy range from 1 to 20 keV with the use of a modified two-center atomic-expansion method. It is shown that the inclusion of united-atom orbitals, in addition to the atomic orbitals of the separated atoms, in a two-center expansion allows for the extension of this method to the low-collision-energy regime. The results of our calculations at low energies from 1 to 5 keV agree with experiments and with the recent multistate molecular-orbital calculations by Kimura and Thorson but differ from the molecular-orbital calculations by Crothers and Hughes. At higher energies our results agree qualitatively with experiments and confirm the dip in 2s and 2p excitation cross sections at Eapprox.11 keV. The impact-parameter dependence of excitation and capture probabilities is also examined to illustrate the evolution of the excitation mechanism from the rotational coupling at lower collision energies to the direct excitation process at higher energies.

Research Organization:
Bereich Kern- und Strahlenphysik, Hahn-Meitner-Institut fuer Kernforschung Berlin GmbH, D-1000 Berlin 39, West Germany
OSTI ID:
5079715
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 26:2; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CATIONS
CHARGE TRANSPORT
CHARGED PARTICLES
COLLISIONS
ELEMENTS
ENERGY
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
HYDROGEN
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
IMPACT PARAMETER
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
KEV RANGE 10-100
KINETIC ENERGY
NONMETALS