Electron capture and fragmentation in Ar{sup 11+} + CO collisions

Journal Article · Wed May 01 04:00:00 EDT 1996 · Bulletin of the American Physical Society

OSTI ID:394221

Ben-Itzhak, I; Wells, E; Stoeckli, M P; Carnes, K D; Tawara, H

Collisions between 3, 10, and 50 keV/q Ar{sup 11+} ions and CO molecules have been studied using the Macdonald Lab CRYEBIS. Coincidence time of flight was used to detect all recoil ions and a position sensitive detector was used to determine final projectile charge states. Single- and double-electron capture are much larger than ionization at these collision energies. The dominant recoil channel associated with the Ar{sup 10+} final state is the CO{sup +} molecular ion. The main ion-pair channel is the C{sup +} + O{sup +} dissociation of CO{sup 2+} while higher charge states of the transient CO{sup q+} fall off rapidly. Charge states up to CO{sup 4+} are formed in the collision indicating that many electrons are captured, but only one (and sometimes two) is retained by the projectile. This is due to autoionization of the highly excited states occupied by the captured electrons. In general, the fragmentation pattern of the CO molecule resembles the fragmentation associated with ionization caused by fast highly charged ions. This is as expected, since both processes happen at large impact parameters.

• OSTI ID: 394221
• Report Number(s): CONF-9605105--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 3 Vol. 41; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ARGON IONS
CARBON MONOXIDE
DISSOCIATION
ELECTRON CAPTURE
ION-MOLECULE COLLISIONS
KEV RANGE 10-100
KEV RANGE 100-1000