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Multiple-electron capture and ionization in collisions of highly stripped ions with Ar atoms

Journal Article · · Phys. Rev. A; (United States)
; ; ; ; ; ;
Multiple-vacancy production in Ar atoms by 1.4-MeV/u highly stripped ion impact is studied. From a recoil-ion--projectile-ion coincidence experiment charge-state distributions of Ar ions were obtained distinguishing between pure ionization and capture of up to three electrons by N/sup 6+,7+/, Fe/sup 12+,15+,20+,21+/, Kr/sup 18 +/, Gd/sup 37 +/, and U/sup 30+,36+,41+,44+,4/ /sup 8 +/ ions. With increasing projectile charge state the relative abundances of multiply charged recoil ions increase. However, for high-charge-state projectiles, the relative fractions of recoil ions for concomitant electron capture and ionization are found to be independent of projectile charge or species. To interpret the data, classical trajectory Monte Carlo calculations have been made assuming the applicability of the independent-electron model. The calculations indicate the dominant electron capture is from the L-shell of Ar while the ionization process includes both the L- and M-shell electrons. The use of a common ionization potential inherent in the application of the independent-electron model is not adequate for the high degrees of ionization obtained in the investigated collisions; the cross sections for the production of high recoil-ion charge states are overestimated. Nevertheless, the calculated total cross sections for ionization and electron capture are in reasonable agreement with the available experimental data.
Research Organization:
University of Giessen, D-6300 Giessen, West Germany
OSTI ID:
5960605
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 33:5; 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
ARGON
ATOM COLLISIONS
CAPTURE
CHARGE STATE
CHARGED PARTICLES
COINCIDENCE METHODS
COLLISIONS
COUNTING TECHNIQUES
CROSS SECTIONS
ELECTRON CAPTURE
ELEMENTS
FLUIDS
GADOLINIUM IONS
GASES
INNER-SHELL IONIZATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
IRON IONS
KRYPTON IONS
MONTE CARLO METHOD
MULTICHARGED IONS
NITROGEN IONS
NONMETALS
RARE GASES
RECOILS
TOTAL CROSS SECTIONS
URANIUM IONS