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Molecular treatment of electron capture by protons from the ground and excited states of alkali-metal atoms

Journal Article · · Phys. Rev. A; (United States)
; ;
Electron-capture cross sections for H/sup +/ plus alkali-metal atom (Na, K, Rb, and Cs) systems have been computed for projectile energies from 10 eV to 10 keV. An impact-parameter perturbed-stationary-state theory using molecular states that incorporate electron translation factors was used to calculate the cross sections. The wave functions were generated by employing the pseudopotential method. These yield equilibrium parameters R/sub e/ and D/sub e/ for the A /sup 2/..sigma../sup +/ molecular state that are in good agreement with ab initio results. Interaction energies are also presented for the LiH/sup +/ system. Basis sets of up to eight-molecular states were used to calculate the electron-capture cross sections from ground (ns) as well as from the first excited (np) states of the alkali-metal atoms. Results for electron capture from the ground-state alkali-metal atom are in good agreement with the recent experiments of Nagata. Electron capture from excited alkali-metal (np) atoms does not yield enhanced cross sections relative to capture from the ground state and, in fact, shows decreased cross sections for the heavy alkali-metal atoms. Such behavior is contrary to predictions made using arguments based on the magnitude of the energy gap ..delta..E to the electron-capture product states.
Research Organization:
Physics Department, University of Missouri-Rolla, Rolla, Missouri 65401
OSTI ID:
6369346
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 26:6; 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
ALKALI METALS
ATOM COLLISIONS
CAPTURE
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON CAPTURE
ELEMENTS
ENERGY LEVELS
ENERGY RANGE
EXCITED STATES
GROUND STATES
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
METALS
PSS METHOD