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Title: Oxygen-induced changes in electron-energy-loss spectra for Al, Be and Ni. [Al; Be; Ni]

Abstract

Electron-energy-loss spectroscopy (EELS) data are presented to illustrate line shape changes that occur as a result of oxygen interaction with metal surfaces. The metals were aluminum, beryllium and nickel. Core-level EELS data were taken for excitations from Al(2p), Be(1s), Ni(3p/3s) and O(1s) levels to the conduction band (CB) density of states (DOS) of the materials. The primary beam energies for the spectra were 300, 450, 300, and 1135 eV, respectively. The data are presented in both the (as measured) first-derivative and the integral forms. The integral spectra were corrected for coherent background losses and analyzed for CB DOS information. These spectra were found to be in qualitative agreement with published experimental and theoretical studies of these materials. One peak in the spectra for Al oxide is analyzed for its correlation with excitonic screening of the Al(2p) core hole. Similar evidence for exciton formation is found in the Ni(3p) spectra for Ni oxide. Data are also presented showing oxygen-induced changes in the lower-loss-energy EELS curves that, in the pure metal, are dominated by plasmon-loss and interband-transition signals. Single-scattering loss profiles in the integral form of the data were calculated using a procedure of Tougaard and Chorkendorff [S. Tougaard and I. Chorkendorff,more » Phys. Rev. B. [bold 35], 6570 (1987)]. For all three oxides these profiles are dominated by a feature with a loss energy of around 20[endash]25 eV. Although this feature has been ascribed by other researchers as due to bulk plasmon losses in the oxide, an alternative explanation is that the feature is simply due to O(2s)-to-CB-level excitations. An even stronger feature is found at 7 eV loss energy for Ni oxide. Speculation is given as to its source. The line shapes in both the core-level and noncore-level spectra can also be used simply as [open quotes]fingerprints[close quotes] of the surface chemistry of the materials. Our data were taken using commercially available surface analysis equipment and serve to complement surface information provided by Auger electron and/or x-ray photoelectron spectroscopy. [copyright] [ital 1999 American Vacuum Society.]« less

Authors:
; ;  [1];  [2]
  1. (Instituto de Fisica Gleb Wataghin, Universidade Estadual de Campinas (UNICAMP), 13081-970 Campinas, Sao Paulo, Brasil)
  2. (Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830 (United States))
Publication Date:
OSTI Identifier:
6336317
Alternate Identifier(s):
OSTI ID: 6336317
Resource Type:
Journal Article
Journal Name:
Journal of Vacuum Science and Technology, A
Additional Journal Information:
Journal Volume: 17:5; Journal ID: ISSN 0734-2101
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALUMINIUM; BERYLLIUM; ENERGY-LOSS SPECTROSCOPY; EXCITONS; LINE WIDTHS; NICKEL; OXIDATION; PLASMONS; SURFACE PROPERTIES; ALKALINE EARTH METALS; CHEMICAL REACTIONS; ELECTRON SPECTROSCOPY; ELEMENTS; METALS; QUASI PARTICLES; SPECTROSCOPY; TRANSITION ELEMENTS 360104* -- Metals & Alloys-- Physical Properties; 400201 -- Chemical & Physicochemical Properties

Citation Formats

Madden, H.H., Landers, R., Kleiman, G.G., and Zehner, D.M. Oxygen-induced changes in electron-energy-loss spectra for Al, Be and Ni. [Al; Be; Ni]. United States: N. p., 1999. Web. doi:10.1116/1.581936.
Madden, H.H., Landers, R., Kleiman, G.G., & Zehner, D.M. Oxygen-induced changes in electron-energy-loss spectra for Al, Be and Ni. [Al; Be; Ni]. United States. doi:10.1116/1.581936.
Madden, H.H., Landers, R., Kleiman, G.G., and Zehner, D.M. Wed . "Oxygen-induced changes in electron-energy-loss spectra for Al, Be and Ni. [Al; Be; Ni]". United States. doi:10.1116/1.581936.
@article{osti_6336317,
title = {Oxygen-induced changes in electron-energy-loss spectra for Al, Be and Ni. [Al; Be; Ni]},
author = {Madden, H.H. and Landers, R. and Kleiman, G.G. and Zehner, D.M.},
abstractNote = {Electron-energy-loss spectroscopy (EELS) data are presented to illustrate line shape changes that occur as a result of oxygen interaction with metal surfaces. The metals were aluminum, beryllium and nickel. Core-level EELS data were taken for excitations from Al(2p), Be(1s), Ni(3p/3s) and O(1s) levels to the conduction band (CB) density of states (DOS) of the materials. The primary beam energies for the spectra were 300, 450, 300, and 1135 eV, respectively. The data are presented in both the (as measured) first-derivative and the integral forms. The integral spectra were corrected for coherent background losses and analyzed for CB DOS information. These spectra were found to be in qualitative agreement with published experimental and theoretical studies of these materials. One peak in the spectra for Al oxide is analyzed for its correlation with excitonic screening of the Al(2p) core hole. Similar evidence for exciton formation is found in the Ni(3p) spectra for Ni oxide. Data are also presented showing oxygen-induced changes in the lower-loss-energy EELS curves that, in the pure metal, are dominated by plasmon-loss and interband-transition signals. Single-scattering loss profiles in the integral form of the data were calculated using a procedure of Tougaard and Chorkendorff [S. Tougaard and I. Chorkendorff, Phys. Rev. B. [bold 35], 6570 (1987)]. For all three oxides these profiles are dominated by a feature with a loss energy of around 20[endash]25 eV. Although this feature has been ascribed by other researchers as due to bulk plasmon losses in the oxide, an alternative explanation is that the feature is simply due to O(2s)-to-CB-level excitations. An even stronger feature is found at 7 eV loss energy for Ni oxide. Speculation is given as to its source. The line shapes in both the core-level and noncore-level spectra can also be used simply as [open quotes]fingerprints[close quotes] of the surface chemistry of the materials. Our data were taken using commercially available surface analysis equipment and serve to complement surface information provided by Auger electron and/or x-ray photoelectron spectroscopy. [copyright] [ital 1999 American Vacuum Society.]},
doi = {10.1116/1.581936},
journal = {Journal of Vacuum Science and Technology, A},
issn = {0734-2101},
number = ,
volume = 17:5,
place = {United States},
year = {1999},
month = {9}
}