Total-capture cross sections for very slow Ar sup 4+ -Ar and Ar sup 6+ -Ar collisions

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Physical Review, A; (USA)

DOI:https://doi.org/10.1103/PhysRevA.42.6905· OSTI ID:6100397

Biedermann, C; Levin, J C; Short, R T; Elston, S B; Gibbons, J P; Sellin, I A ^[1]; Cederquist, H; Andersson, L R; Andersson, H; Liljeby, L ^[2]

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1. Department of Physics, University of Tennessee, Knoxville, TN (USA) Oak Ridge National Laboratory, Oak Ridge, TN (USA)
2. Manne Siegbahn Institute of Physics, Stockholm (Sweden)

We present experimental and calculated total single-electron capture cross sections for Ar{sup 4+}-Ar collisions in the laboratory energy ranges 100--800 and 10--800 eV, respectively. The experimental results for post-collisional energy and angular distributions of Ar{sup 3+} extend down to 19 eV; below 100 eV a part of the angular distribution falls outside the {plus minus}9{degree} angular acceptance. The absolute calibration of our Ar{sup 4+}-Ar results is achieved by means of normalization of relative Ar{sup 6+}-Ar single-capture cross sections to absolute total cross sections from the literature. Calculated single-electron capture cross sections for Ar{sup 4+}-Ar are obtained from a multichannel Landau-Zener model with semiempirical coupling strengths that reproduce the experimental state-selective angular distributions. When these theoretical angular distributions are integrated over the experimental angular acceptance, the agreement between experimental and calculated cross sections is excellent down to 19 eV. We also present total experimental cross sections for removing two electrons from Ar for collisions with Ar{sup 6+} at 800, 600, and 450 eV, and for 800-eV collisions with Ar{sup 4+}.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6100397
• Journal Information: Physical Review, A; (USA), Journal Name: Physical Review, A; (USA) Vol. 42:11; ISSN 1050-2947; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ARGON IONS
ATOM COLLISIONS
CAPTURE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON CAPTURE
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
FLUIDS
GASES
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
LANDAU-ZENER FORMULA
MULTICHARGED IONS
NONMETALS
RARE GASES
TOTAL CROSS SECTIONS