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

Abstract

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%.

Authors:
; ; ; ;  [1]
  1. Institut fuer Allgemeine Physik, Technische Universitaet Wien, Wiedner Hauptstrae 8-10/134, A-1040 Wien (Austria)
Publication Date:
OSTI Identifier:
6274399
Resource Type:
Journal Article
Journal Name:
Physical Review A; (United States)
Additional Journal Information:
Journal Volume: 48:3; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ARGON IONS; BEAM NEUTRALIZATION; GOLD; ION COLLISIONS; KRYPTON IONS; NEON IONS; NITROGEN IONS; XENON IONS; AUGER EFFECT; CATIONS; EV RANGE; MULTICHARGED IONS; NITROGEN; POLYCRYSTALS; PROJECTILES; RARE GASES; SECONDARY EMISSION; SIMULATION; STATISTICS; SURFACE CLEANING; CHARGED PARTICLES; CLEANING; COLLISIONS; CRYSTALS; ELEMENTS; EMISSION; ENERGY RANGE; FLUIDS; GASES; IONS; MATHEMATICS; METALS; NONMETALS; SURFACE FINISHING; TRANSITION ELEMENTS; 665300* - Interactions Between Beams & Condensed Matter- (1992-)

Citation Formats

Kurz, H, Aumayr, F, Lemell, C, Toeglhofer, K, and Winter, H. Neutralization of slow multicharged ions at a clean gold surface: Electron-emission statistics. United States: N. p., 1993. Web. doi:10.1103/PhysRevA.48.2192.
Kurz, H, Aumayr, F, Lemell, C, Toeglhofer, K, & Winter, H. Neutralization of slow multicharged ions at a clean gold surface: Electron-emission statistics. United States. https://doi.org/10.1103/PhysRevA.48.2192
Kurz, H, Aumayr, F, Lemell, C, Toeglhofer, K, and Winter, H. Wed . "Neutralization of slow multicharged ions at a clean gold surface: Electron-emission statistics". United States. https://doi.org/10.1103/PhysRevA.48.2192.
@article{osti_6274399,
title = {Neutralization of slow multicharged ions at a clean gold surface: Electron-emission statistics},
author = {Kurz, H and Aumayr, F and Lemell, C and Toeglhofer, K and Winter, H},
abstractNote = {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%.},
doi = {10.1103/PhysRevA.48.2192},
url = {https://www.osti.gov/biblio/6274399}, journal = {Physical Review A; (United States)},
issn = {1050-2947},
number = ,
volume = 48:3,
place = {United States},
year = {1993},
month = {9}
}