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Physics

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Displaying 1226 - 1250 of 1261

Cross Sections for Ionization of Inner-shell Electrons by Electrons

January 1, 1976
Author(s)
Cedric Powell
A survey is given of the available cross-section data for ionization of inner-shell electrons by incident electrons in the range of interest for electron-probe microanalysis and for Auger-electron spectroscopy of solid surfaces. Owing to the paucity of

Electron Attenuation Lengths for Free-Electron-Like Metals

January 1, 1976
Author(s)
David R. Penn
Mean free paths for electrons in bulk jellium are calculated for hot electrons with energies from a few hundred to a few thousand electron volts and for values of r s from 1.5 to 5. Exchange and correlation effects are included and the results are compared

Quantitative Chemical Analysis by ESCA

January 1, 1976
Author(s)
David R. Penn
Electron spectroscopy for chemical analysis (ESCA) can be used as a quantitative tool for the determination of the chemical composition of the surface region of a solid if certain parameters are known. The least well known is the electron mean free path

Measurement of the Surface Density of States by Field Ionization

October 1, 1975
Author(s)
David R. Penn
It is shown that recent measurements of field ion energy distributions from clean tungsten surfaces probe the density of metal states in the vicinity of the surface. We find j() = (2/kh)m| d3rm(r) z|2(-m), where j() is the ion current a , mand m are

Optical Properties of Adsorbate Atoms

May 15, 1975
Author(s)
A J. Bennett, David R. Penn
We calculate the dielectric response of adsorbate atoms on a metal surface assuming an Anderson model of the system. The dielectric function is then used to predict the change in the surface optical reflectance caused by the adsorbates. General results are

Relaxation Energies in Chemisorption Spectroscopy

January 1, 1975
Author(s)
John William Gadzuk
The upward shift in atomic energy levels (or decrease in electron binding energies) which occurs upon sorption of an atom on a metal surface due to polarization of the valence band electrons, is considered. The polarization shift or extra-atomic relaxation
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