Evidence for above- and sub-surface neutralization during interactions of highly charged ions with a metal surface

Journal Article · Tue Dec 01 04:00:00 EST 1992 · Bulletin of the American Physical Society

OSTI ID:127932

Meyer, F W; Overbury, S H; Havener, C C ^[1]

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1. Oak Ridge National Lab., TN (United States); and others

Projectile K-Auger have been studied for 60-keV N{sup 6+} ions incident on Au and Cu single crystal targets in the range of angles 0.20 to 20{degrees}. The shape of the observed projectile K-Auger emission is characterized by two resolvable components with strikingly different dependences on perpendicular velocity. A {open_quotes}fast{close_quotes} component, limited by the rate of K-Auger decay in the essentially neutralized projectile, dominates and is ascribed to {open_quotes}sub-surface{close_quotes} emissions. This component was satisfactorily modelled using a Monte Carlo simulation of the detailed projectile trajectories and close binary encounters with target atoms inside the bulk after surface penetration. The simulation was able to reproduce reasonably well the experimentally observed dependences on projectile incidence angle, target crystal azimuth, and observation angle. A much weaker {open_quotes}slow{close_quotes} component appears at very small angles and has a time dependence characteristic of the neutralization-deexcitation cascade predicted to occur above the surface prior to surface pentrations.

• DOE Contract Number: AC05-84OR21400; FG05-87ER40361
• OSTI ID: 127932
• Report Number(s): CONF-920376--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 9 Vol. 37; ISSN 0003-0503; ISSN BAPSA6
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
AUGER EFFECT
BEAM NEUTRALIZATION
COPPER
GOLD
ION COLLISIONS
NITROGEN IONS
SOLIDS