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Physics

Condensed matter

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Displaying 1201 - 1225 of 1242

Improved Microwave-discharge Source for uv Photoemission

April 1, 1976
Author(s)
Theodore V. Vorburger, B Waclawski, D Sandstrom
A microwave-discharge uv light source has been improved to yield significant photon fluxes at 26.9 and 40.81 eV. In order to optimize the 26.9-eV (NeII) and 40.81-eV (HeII) radiation, the discharge was operated at ~2.5 Pa (0.019 Torr) in an external

Core Level Shifts in the 3d Transition Metals and Tin

March 15, 1976
Author(s)
R E. Watson, M L. Perlman, J F. Herbst
We present estimates of various contributions to the free-atom-metal binding-energy shifts, Δ}E B, for the 2>s and 2p core levels of teh iron series elements and, for comparison, the 3 d s/2 level of Sn. Our results indicate that the sharp break in the

4f Excitation Energies in Rare-Earth Metals: Relativistic Calculations

February 15, 1976
Author(s)
J F. Herbst, R E. Watson, J W. Wilkins
We describe calculations of 4f electron binding energies for the rare-earth metals. Relativistic Hartree-Fock calculations for atomic configurations most closely approximating those of the metals are initially performed, and crystal potentials are

Effect of Ground State and Excitation Potentials on Energy Levels of Ni Metal

February 15, 1976
Author(s)
R E. Watson, J F. Herbst, L Hodges, B I. Lundqvist, J W. Wilkins
Self-consistent energy-band calculations for paramagnetic Ni have been performed in an effort to compare ground-state and excitationpotential prescriptions; potentials of the Hartree-Fock-Wigner-Seitz and Hedin-Lundqvist type are examined. We find the

Cross Sections for Ionization of Inner-shell Electrons by Electrons

January 1, 1976
Author(s)
Cedric J. 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
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