Neutralization of slow multicharged ions at a clean gold surface: Electron-emission statistics

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.48.2192· OSTI ID:6274399

Kurz, H; Aumayr, F; Lemell, C; Toeglhofer, K; Winter, H ^[1]

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1. Institut fuer Allgemeine Physik, Technische Universitaet Wien, Wiedner Hauptstrae 8-10/134, A-1040 Wien (Austria)

Emission of slow electrons ([ital E][sub [ital e]][le]60 eV) induced by impact of slow multicharged ions (impact velocity [ital v][sub [ital p]][le]2[times]10[sup 5] m/s) onto an atomically clean, polycrystalline gold surface has been studied both experimentally and by numerical simulation, based on the resulting electron-emission statistics. The projectile ions (N[sup [ital q]+], [ital q]=5,6; Ne[sup [ital q]+], [ital q]=5--10; Ar[sup [ital q]+], [ital q]=5--16; Kr[sup [ital q]+], [ital q]=5--10; Xe[sup [ital q]+], [ital q]=6,8,10; I[sup [ital q]+], [ital q]=16,20,23,25) have been extracted from a recoil ion source pumped by the GSI UNILAC heavy-ion accelerator in Darmstadt, Germany. We discuss the shape of the experimentally obtained electron-emission statistics and, by means of numerical simulation based on the classical over-the-barrier model put forward recently by Burgdoerfer, Lerner, and Meyer [Phys. Rev. A 44, 5674 (1991)], identify the various processes contributing to the above-surface'' electron emission, i.e., taking place until projectile impact on the surface. In particular, for impact of slow ([ital E][ge]50 eV) Ar[sup 12+] we show that most of the emitted electrons have energies below 50 eV, with the above-surface-produced fast Auger electrons being a small minority of less than 1%.

• OSTI ID: 6274399
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 48:3; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

665300* -- Interactions Between Beams & Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ARGON IONS
AUGER EFFECT
BEAM NEUTRALIZATION
CATIONS
CHARGED PARTICLES
CLEANING
COLLISIONS
CRYSTALS
ELEMENTS
EMISSION
ENERGY RANGE
EV RANGE
FLUIDS
GASES
GOLD
ION COLLISIONS
IONS
KRYPTON IONS
MATHEMATICS
METALS
MULTICHARGED IONS
NEON IONS
NITROGEN
NITROGEN IONS
NONMETALS
POLYCRYSTALS
PROJECTILES
RARE GASES
SECONDARY EMISSION
SIMULATION
STATISTICS
SURFACE CLEANING
SURFACE FINISHING
TRANSITION ELEMENTS
XENON IONS