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

doi:https://doi.org/10.1103/PhysRevA.48.2192

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

Full Record
Other Related Research

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:

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

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

Publication Date:: 1993-09-01

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.

Copy to clipboard


                    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

Copy to clipboard


                    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.

Copy to clipboard


                    
@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}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1103/PhysRevA.48.2192

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

Neutralization of slow multicharged ions at a clean gold surface: Total electron yields

Journal Article Kurz, H ; Aumayr, F ; Lemell, C ; ... - Physical Review A; (United States)

Total slow-electron ([ital E][sub [ital e]][le]60 eV) yields as derived from measured electron-emission statistics are presented for impact of various slow ([ital v][sub [ital p]][le]10[sup 5] m/s) multicharged ions (N[sup 5+],N[sup 6+],Ne[sup 5+]--Ne[sup 10+], Ar[sup 5+]--Ar[sup 16+], Kr[sup 5+]--Kr[sup 10+], Xe[sup 6+],Xe[sup 8+],Xe[sup 10+], and I[sup 16+],I[sup 20+],I[sup 23+],I[sup 25+]) on atomically clean polycrystalline gold. The experimental data can successfully be modeled by classical over-barrier-type calculations, in which way three different electron-emission processes have been identified, i.e., autoionization of the transiently neutralized projectile ( hollow atom'') on its approach toward the surface, promotion into vacuum of electrons captured by themore »« less
https://doi.org/10.1103/PhysRevA.48.2182
Electron emission and image-charge acceleration for the impact of very highly charged ions on clean gold

Journal Article Kurz, H ; Aumayr, F ; Winter, H ; ... - Physical Review A; (United States)

We present total yields for emission of slow ([ital E][sub [ital e]][le]50 eV) electrons due to the impact of slow ([ital v][sub [ital p]][le]5[times]10[sup 5] m/s) highly charged ions [Ar[sup [ital q]+] ([ital q][le]18), Xe[sup [ital q]+] ([ital q][le]51), and Th[sup [ital q]+] ([ital q][le]80)] on clean polycrystalline gold. The highly charged ions were produced in the Lawrence Livermore National Laboratory electron-beam ion trap; electron yields have been derived from the respective measured electron emission statistics. The experimental data support a currently accepted scenario for multicharged ion-induced electron emission, which is largely based on a classical over-barrier model. In particular,more »« less
https://doi.org/10.1103/PhysRevA.49.4693
Electron emission from slow highly charged ions interacting with a metal surface

Conference Aumayr, F ; Kurz, H ; Toeglhofer, K ; ... - AIP Conference Proceedings (American Institute of Physics); (United States)

Recent progress in investigating electron emission from slowly highly charged ions approaching a metal surface is discussed. In particular, new informations on generation and decay of transient multiply excited hollow atoms'' developing during these process have been gained from measurement of the statistics of emitted electrons (ES). ES and precise total electron yields derived from the former have been measured for normal incidence of slow (impact velocity 1--15[center dot]10[sup 4] ms[sup [minus]1]) multicharged ions Nq[sup +] (q[le]6), Ne[sup q+](q[le]10), Ar[sup q+](q[ge]16), Kr[sup q+](q[le]10), Xe[sup q+](q[le]10) and I[ital q][sup +]([ital q][le]25) on clean polycrystalline gold. A classical over-barrier approach as recentlymore »« less
Kinetic electron emission for impact of multicharged ions on clean gold

Journal Article Winter, H P ; Eder, H ; Vana, M ; ... - Bulletin of the American Physical Society

Theory and experimental studies of slow multicharged ion (MCI, charge state q) impact on solid surfaces regard emission of slow and fast electrons and soft X-rays from transient {open_quotes}hollow atoms{close_quotes} above, at and below the surface. Faster MCI also cause kinetic electron emission which depends on q in a not yet well understood manner regarding, e.g., momentum transfer from variably screened MCI to free target electrons, and electron promotion in collisional quasimolecules. Measured electron number statistics delivered highly accurate ({plus_minus} 4%) total slow electron yields for impact of H{sup +}, He{sup +}, He{sup 2+}, C{sup q+}, N{sup q+}, O{sup q+}more »« less
Emission of electrons from a clean gold surface induced by slow, very highly charged ions at the image charge acceleration limit

Journal Article Aumayr, F ; Kurz, H ; Schneider, D ; ... - Physical Review Letters; (United States)

Total low-energy electron yields for the normal incidence interaction of slow, very highly charged ions ([sup 136]Xe[sup [ital q]+], 21[le][ital q][le]51; [sup 232]Th[sup [ital q]+], 51[le][ital q][le]80) with a clean gold surface have been determined from the related measured electron emission statistics. The projectile impact energies could be reduced down to the image charge acceleration limit. The electron emission yield was found to increase proportionally with the increasing projectile charge state in all cases studied, suggesting no saturation in the ability of the Au target to provide necessary electrons within the above surface interaction time (e.g., about 280 electrons/projectile formore »« less
https://doi.org/10.1103/PhysRevLett.71.1943

Similar Records