One and two electron processes in collisions of highly charged ions with He at velocities around 1 a. u

Conference · Wed Dec 15 04:00:00 EST 1993 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:6695225

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

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1. J. R. Macdonald Laboratory, Kansas State University, Manhattan, Kansas 66506 (United States)

We have studied one and two electron processes in collisions of Ar[sup 16+] and O[sup 8+] ions with He atoms at velocities between 0.23 and 1.67 a.u. These processes were identified by measuring the final charges of the projectile and recoil ions in coincidence. Single electron capture (SC) is the dominant process at all our velocities. Transfer ionization (TI), where the He loses both electrons but the projectile captures only one, is next largest. Double capture (DC) and single ionization (SI) are about 10 times smaller, with DC larger for Ar and SI negligible for O. None of these processes show any dramatic velocity dependence. The energy independence of SI is somewhat surprising as our measurements span the velocity region where ionization would be expected to increase. Our analysis suggests that the ionization process is being suppressed by SC and TI processes. The average Q-values for capture channels were determined by measuring the longitudinal momenta of the recoiling target ions. The Q-values for both SC and TI decrease with increasing projectile energy, which indicates that electrons are captured into less tightly bound states as the collision velocity is increased.

• OSTI ID: 6695225
• Report Number(s): CONF-9309229--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 295:1
• 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
CAPTURE
CHARGED PARTICLES
COLLISIONS
ELECTRON CAPTURE
ELEMENTS
ENERGY DEPENDENCE
ENERGY RANGE
FLUIDS
GASES
HELIUM
IMPACT PARAMETER
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
KEV RANGE
MULTICHARGED IONS
NONMETALS
OXYGEN IONS
RARE GASES