Electron capture and excitation in collisions of O[sup +]([sup 4][ital S],[sup 2][ital D],[sup 2][ital P]) ions with He atoms and He[sup +] ions with O atoms at energies below 10 keV

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

DOI:https://doi.org/10.1103/PhysRevA.50.4854· OSTI ID:6804358

Kimura, M ^[1]; Gu, J P; Liebermann, H P; Li, Y; Hirsch, G; Buenker, R J ^[2]; Dalgarno, A ^[3]

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1. Argonne National Laboratory, Argonne, Illinois 60439 (United States) Department of Physics, Rice University, Houston, Texas 77251 (United States)
2. Theoretische Chemie, Bergische Universitaet-Gesamthochschule Wuppertal, D-42097 Wuppertal (Germany)
3. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, Massachusetts 02138 (United States)

Electron capture and excitation in O[sup +]([sup 4][ital S],[sup 2][ital D],[sup 2][ital P])+He collisions above 100 eV are studied theoretically by using a semiclassical molecular representation and electron capture in He[sup +]+O([sup 3][ital P]) collisions; excitation and deexcitation in O[sup +]([sup 4][ital S])+He[leftrightarrow]O[sup +]([sup 2][ital D])+He collisions at lower energies are studied by using a fully-quantum-mechanical molecular representation. At higher energies, nonadiabatic couplings are the driving forces that cause transitions. At collision energies below 10 eV, transitions are driven by spin-orbit couplings. At kilo-electron-volt energies, the contribution from metastable O[sup +]([sup 2][ital D],[sup 2][ital P]) ions to electron capture is much larger than that from the ground O[sup +]([sup 4][ital S]) ions. At energies below 1 eV, the cross section for electron capture in He[sup +]+O collisions is very small, with a magnitude of less than 10[sup [minus]20] cm[sup 2]. The cross sections for the excitation-deexcitation of metastable O[sup +] ions are larger, with values near 10[sup [minus]18] cm[sup 2].

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6804358
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 50:6; 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
CAPTURE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DE-EXCITATION
ELECTRON CAPTURE
ELEMENTS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUIDS
GASES
HELIUM
HELIUM IONS
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
NONMETALS
OXYGEN
OXYGEN IONS
RARE GASES
SEMICLASSICAL APPROXIMATION