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Physics

Condensed matter

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Displaying 1226 - 1250 of 1253

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

Surface Molecules and Chemisorption, I. Adatom Density of States

May 1, 1974
Author(s)
John William Gadzuk
A useful picture of chemisorption on metal surfaces is one in which a localized molecule is formed between the adatom and its nearest neighbor substrate atoms. The interaction responsible for the molecule formation is treated as the coupling between the

Field Emission as a Probe of the Surface Density of States

February 15, 1974
Author(s)
David R. Penn, E. W. Plummer
Field-emission measurements of the total-energy distribution from a clean metal surface are shown to provide information about the density of states near the surface. Specifically, we find the field-emitted current per unit energy at energy ω to be given

Valence-Band Auger-Electron Spectra for Aluminum

February 15, 1974
Author(s)
John William Gadzuk
Recent measurements of the L 23VV auger spectrum of Al by Powell, have shown that the observed energy distributions do not correspond to the self-convolution of the Al bulk density of states. Attempts to account for this discrepancy in terms of energy

Field Emission Energy Distribution (FEED)

July 1, 1973
Author(s)
John William Gadzuk, E. W. Plummer
The technique of measuring the energy distribution of electron which have been field emitted from a cold cathode is considered. The genral historical and introductory theory is presented. A survey of the experimental techniques and existing energy

Contrasting Valence-Band Auger-Electron Spectra for Silver and Aluminum

June 4, 1973
Author(s)
Cedric J. Powell
Measurements of the L 2,3VV (V=valence) Auger spectrum of aluminum and the M 4,5VV Auger spectrum of silver cannot be simply related to the valence-band density of states. The data for Al indicate a strong energy variation of the transition probability
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