Nonradiative and radiative electron capture in collisions of He[sup +] ions with C atoms below 1000 eV

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.49.2541· OSTI ID:5120433

Kimura, M; Dalgarno, A ^[1]; Chantranupong, L; Li, Y; Hirsch, G; Buenker, R J ^[2]

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1. Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138 (United States)
2. Theoretische Chemie, Bergische Universitaet-Gesamthochschule Wuppertal, D-42097 Wuppertal (Germany)

Nonradiative and radiative electron captures in collisions of He[sup +] ions with carbon atoms at energies below 1 keV are studied theoretically by using a molecular-orbital expansion method to calculate the adiabatic potential-energy curves and the nonadiabatic coupling matrix elements of CHe[sup +]. The corresponding scattering equations are solved. For nonradiative transitions, electron capture into channels separating to He+C[sup +]([sup 2][ital D]) are found to be dominant below 10 eV. However, as the energy increases, the channels separating to He+C[sup +]([sup 2][ital P]) take over because of the positive asymptotic energy defect. At 100 eV, the nonradiative capture cross section is 5[times]10[sup [minus]17] cm[sup 2]. The radiative electron-capture cross section is found to be very small, with a magnitude nowhere greater than 10[sup [minus]22] cm[sup 2].

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5120433
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 49:4; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CALCULATION METHODS
CAPTURE
CARBON
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON CAPTURE
ELEMENTS
EMISSION
ENERGY RANGE
EV RANGE
HELIUM IONS
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
MOLECULAR ORBITAL METHOD
NONMETALS
PHOTON EMISSION