Molecular treatment of electron capture in atomic collisions in the meV- to keV-energy regime: Collisions of C sup 5+ ions with H atoms and the effect of core electrons

Journal Article · Mon Jun 01 04:00:00 EDT 1992 · Physical Review A. General Physics; (United States)

DOI:https://doi.org/10.1103/PhysRevA.45.7876· OSTI ID:7105591

Shimakura, N ^[1]; Koizumi, S; Suzuki, S ^[2]; Kimura, M ^[3]

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1. General Education Department, Niigata University, Niigata 950-21 (Japan)
2. Department of Chemistry, Faculty of Science, Niigata University, Niigata 950-21 (Japan)
3. Argonne National Laboratory, Argonne, Illinois 60439 (United States) Department of Physics, Rice University, Houston, Texas 77251 (United States)

Electron-capture processes in collisions of C{sup 5+} ions with H atoms are investigated theoretically by using quantum-mechanical and semiclassical molecular-orbital methods in the collision-energy range from meV/amu to keV/amu. Atomic-type electron-translation factors are appropriately incorporated to ensure correct scattering boundary conditions. Total capture cross sections have a broad minimum at 0.4 keV/amu that is caused by the change of major contributors. The dominant capture channels in the triplet manifold are C{sup 4+}(1{ital s}4{ital s}) below 0.1 keV/amu and C{sup 4+}(1{ital s}4{ital p}), C{sup 4+}(1{ital s}4{ital d}), and C{sup 4+}(1{ital s}3{ital p}) above that energy. In the singlet manifold, below 0.5 keV/amu, the dominant channel is C{sup 4+}(1{ital s}4{ital s}), as in the triplet manifold. However, above that energy the C{sup 4+}(1{ital s}4{ital f}), C{sup 4+}(1{ital s}4{ital d}), C{sup 4+}(1{ital s}3{ital p}), and C{sup 4+}(1{ital s}3{ital d}) channels become important. The present results for the total capture cross section is in excellent accord with the measurements by Phaneuf {ital et} {ital al}. (Phys. Rev. A 26, 1892 (1982)) and Crandall, Phaneuf, and Meyer (Phys. Rev. A 19, 504 (1979)) over the entire energy region studied. The effect of core electrons on the capture process is examined by using data from the present (C{sup 5+}+H) system and the previously studied (N{sup 5+}+H) and (B{sup 5+}+H) systems, and some remarks on the role of core electrons are made on the basis of an argument concerning the overlap of electronic charge distribution.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 7105591
• Journal Information: Physical Review A. General Physics; (United States), Journal Name: Physical Review A. General Physics; (United States) Vol. 45:11; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CAPTURE
CARBON IONS
CATIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON CAPTURE
ELEMENTS
ENERGY RANGE
HYDROGEN
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
MOLECULAR ORBITAL METHOD
MULTICHARGED IONS
NONMETALS