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Title: Charge transfer processes and sputtering processes of self-sustaining alkali metal coatings on metal surfaces

Abstract

It is well known that adsorption of electronegative or electropositive atoms on a metal surface results in charge transfer between the metal conduction band and the adsorbate atom. This charge transfer results in the formation of a coverage-dependent image dipole and a consequent change in the work function and adsorbate binding energy. The secondary electron yield and the charge state of surface atoms desorbed by thermal, electron impact or ion impact desorption processes are closely related to the effective adsorbate charge. This paper discusses the effect of Gibbsian segregation (lowest free energy) as a means of producing similar effects for electropositive (alkali metal) layers on a number of metal substrates. Classical chemisorption theory is used as a means of estimating the adsorbate effective charge and results are compared with models used to predict the secondary ion fraction of sputtered atoms. The resulting concept of self-sustaining sputter-resistant coatings is analyzed in the context of applications to the fusion environment as well as to, e.g., materials for high current electrical contacts.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (USA); North Carolina State Univ., Raleigh (USA). Dept. of Nuclear Engineering; Nagoya Univ. (Japan). Inst. of Plasma Physics; Georgia Inst. of Tech., Atlanta (USA). Nuclear Engineering Dept.
OSTI Identifier:
7154951
Report Number(s):
CONF-860807-2
ON: DE87004947
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 6. international workshop on inelastic ion surface collisions, Argonne, IL, USA, 25 Aug 1986; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM BASE ALLOYS; SPUTTERING; COPPER BASE ALLOYS; LITHIUM ALLOYS; ADSORPTION; ALKALI METALS; ARGON IONS; AUGER ELECTRON SPECTROSCOPY; CHARGE TRANSPORT; CHEMISORPTION; COATINGS; DEUTERON BEAMS; FORMATION FREE ENTHALPY; HELIUM IONS; ION BEAMS; PHOTOELECTRON SPECTROSCOPY; SEGREGATION; SURFACES; ALLOYS; ALUMINIUM ALLOYS; BEAMS; CHARGED PARTICLES; CHEMICAL REACTIONS; COPPER ALLOYS; ELECTRON SPECTROSCOPY; ELEMENTS; ENERGY; FREE ENTHALPY; IONS; METALS; PHYSICAL PROPERTIES; SEPARATION PROCESSES; SORPTION; SPECTROSCOPY; THERMODYNAMIC PROPERTIES; 360106* - Metals & Alloys- Radiation Effects

Citation Formats

Krauss, A R, Auciello, O, Uritani, A, Valentine, M, Mendelsohn, M, and Gruen, D M. Charge transfer processes and sputtering processes of self-sustaining alkali metal coatings on metal surfaces. United States: N. p., 1986. Web.
Krauss, A R, Auciello, O, Uritani, A, Valentine, M, Mendelsohn, M, & Gruen, D M. Charge transfer processes and sputtering processes of self-sustaining alkali metal coatings on metal surfaces. United States.
Krauss, A R, Auciello, O, Uritani, A, Valentine, M, Mendelsohn, M, and Gruen, D M. 1986. "Charge transfer processes and sputtering processes of self-sustaining alkali metal coatings on metal surfaces". United States.
@article{osti_7154951,
title = {Charge transfer processes and sputtering processes of self-sustaining alkali metal coatings on metal surfaces},
author = {Krauss, A R and Auciello, O and Uritani, A and Valentine, M and Mendelsohn, M and Gruen, D M},
abstractNote = {It is well known that adsorption of electronegative or electropositive atoms on a metal surface results in charge transfer between the metal conduction band and the adsorbate atom. This charge transfer results in the formation of a coverage-dependent image dipole and a consequent change in the work function and adsorbate binding energy. The secondary electron yield and the charge state of surface atoms desorbed by thermal, electron impact or ion impact desorption processes are closely related to the effective adsorbate charge. This paper discusses the effect of Gibbsian segregation (lowest free energy) as a means of producing similar effects for electropositive (alkali metal) layers on a number of metal substrates. Classical chemisorption theory is used as a means of estimating the adsorbate effective charge and results are compared with models used to predict the secondary ion fraction of sputtered atoms. The resulting concept of self-sustaining sputter-resistant coatings is analyzed in the context of applications to the fusion environment as well as to, e.g., materials for high current electrical contacts.},
doi = {},
url = {https://www.osti.gov/biblio/7154951}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 01 00:00:00 EST 1986},
month = {Wed Jan 01 00:00:00 EST 1986}
}

Conference:
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