Differential electron emission in multi-charged ion atom collisions: Systematics for distant and close collisions

Conference · Tue Sep 01 04:00:00 EDT 1992

OSTI ID:10109585

DuBois, R D; Toburen, L H; Middendorf, M E ^[1]; Jagutzki, O ^[2]

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1. Pacific Northwest Lab., Richland, WA (United States)
2. Institute fuer Kernphysik der J.W. Goethe Universitat Frankfurt (Germany)

Absolute doubly differential cross sections for electron emission are presented for 0.5 MeV/u multi-charged ion impact on helium, neon, and argon targets. For the helium target, Bq+, Cq+ (q = 2--5) and Oq+, Fq+ (q = 3--6) projectiles were studied; for neon and argon, only Cq+ (q = 2--5) projectiles were used. Electron emission for 10{degrees} {le} {Theta} {le} 60{degrees} was studied. The measured cross sections were assumed to scale as the square of an effective projectile charge, Z{sub eff}, which was determined as a function of emitted electron energy and angle. For distant collisions (low emitted electron energies), we find that Z{sub eff} {approx} q for small q and Z{sub eff} < q for the highest values of q investigated. For sufficiently close collisions (above the binary encounter peak), Z{sub eff} > Z and increases as q decreases. This is true for all angles and targets investigated.

• Research Organization: Pacific Northwest Lab., Richland, WA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 10109585
• Report Number(s): PNL-SA--21302; CONF-920948--11; ON: DE93004324
• Country of Publication: United States
• Language: English

Related Subjects

664300
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
COLLISION PHENOMENA
DIFFERENTIAL CROSS SECTIONS
ELECTRON EMISSION
HELIUM
ION-ATOM COLLISIONS
IONIZATION
MULTICHARGED IONS
NEON