Velocity dependence of one- and two-electron processes in intermediate-velocity Ar[sup 16+]+He collisions

Journal Article · Mon Nov 01 04:00:00 EST 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.48.3617· OSTI ID:5968201

Wu, W; Giese, J P; Ben-Itzhak, I; Cocke, C L; Richard, P; Stockli, M; Ali, R; Schoene, H ^[1]; Olson, R E ^[2]

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1. J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506-2604 (United States)
2. Physics Department, University of Missouri-Rolla, Rolla, Missouri 65041 (United States)

We report investigations of one- and two-electron processes in the collisions of 0.9-keV/u to 60-keV/u ([ital v][sub [ital p]]=0.19--1.55 a.u.) Ar[sup 16+] ions with He targets. The cross sections for these processes were measured by observing the final charges of the Ar ions and the recoiling target ions in coincidence. The average [ital Q] values for the capture channels were determined by measuring the longitudinal momenta of the recoiling target ions. Single capture (SC) is the dominant process and is relatively independent of the projectile energy. The two-electron transfer-ionization (TI) process is the next largest and slowly increases with projectile energy. The [ital Q] values for both SC and TI decrease with increasing projectile energy. Our data thereby suggest that electrons are captured into less tightly bound states as the collision velocity is increased. Both double capture and single ionization are much smaller and fairly independent of the projectile energy. The energy independence of SI is somewhat surprising as our energy range spans the region of the target electron velocity where ionization would be expected to increase. Our analysis suggests that the ionization process is being suppressed by SC and TI processes.

• OSTI ID: 5968201
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 48:5; 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
ARGON IONS
ATOM COLLISIONS
CHARGE STATES
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON TRANSFER
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
HELIUM
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
KEV RANGE 10-100
MULTICHARGED IONS
NONMETALS
RARE GASES