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Physics

Condensed matter

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Displaying 1176 - 1200 of 1237

Angle-resolved photoemission from crystal-field-split adatom levels

April 15, 1977
Author(s)
J F. Herbst
We investigate the angular distribution of photoelectrons emitted from atoms physisorbed on the surface of a metal. The crystalline electric field of the surface is represented by a small number of point charges in the vicinity of the adatom, and the

Secondary-Electron Energy Distribution in High-Energy Photoemission

January 1, 1977
Author(s)
David R. Penn
We have calculated the energy distribution of secondary electrons observed in core-level XPS or core-level synchrotron photoemission experiments on Al. The secondary electrons are produced when the photoexcited primary electrons scatter inelastically from

Vibrational Excitation in Photoemission Spectroscopy of Condensed Molecules

December 15, 1976
Author(s)
John William Gadzuk
Photoelectron spectra of gas-phase molecules display sharp vibrational structure. The envelope of the spectrum is determined by the Franck-Condon factor. On the other hand, photoelectron spectra of the same molecules, adsorbed or condensed onto metal

Angle Resolved Auger Surface Spectroscopy

November 1, 1976
Author(s)
John William Gadzuk
The angular distribution of electrons ejected in core-valence-valence Auger transitions of atoms chemisorbed on metal surfaces is considered theoretically. Since the valence electrons participating in the Auger transition are also involved in chemical

Comment on Field emission as a probe of the surface density of states

July 15, 1976
Author(s)
David R. Penn
It is shown that the primary contribution to the field-emission current comes from electrons with total momentum equal to zero in a direction parallel to the metal surface and that the field-emission current measures the density of states at a point

Core level shifts of rare-gas atoms implanted in the noble metals

July 1, 1976
Author(s)
R E. Watson, J F. Herbst, J W. Wilkins
By means of soft-x-ray photoemission Citrin and Hamann have observed core level shifts of Ne, Ar, Kr, and Xe atoms implanted in the noble metals and have constructed a theoretical model with which to interpret the results. We describe calculations

Electron mean free paths for free-electron-like materials

June 15, 1976
Author(s)
David R. Penn
Mean free paths for electrons in bulk jellium are calculated for electrons with energies from a few hundred to a few thousand eV and for values of r s for 1.5 to 5 where r s is the average distance between valence electrons measured in units of the Bohr

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
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