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Physics

Condensed matter

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Displaying 1126 - 1150 of 1242

Optical Properties of Small Metal Spheres: Surface Effects

April 25, 1983
Author(s)
David R. Penn, S Apell
It has been assumed that the optical properties of small spheres can be understood by means of a Drude dielectric function that incorporates a boundary scattering rate 1 / τ s~=v F / R, where vF is the Fermi velocity and R is the sphere radius. An

Anomalous Electron Energy Loss in Small Spheres

January 1, 1983
Author(s)
David R. Penn, S Apell
In analogy to the case of optical absorption, it is shown that inclusion of non-local surface effects results in a very large contribution to the energy loss of fast electrons scattered by a sphere. The scattering is found to be predominantly in the

The Diamond (111) Surface: A Dilemma Resolved

January 1, 1983
Author(s)
B B. Pate, B Waclawski, P M. Stefan, C Binns, T Ohta, M H. Hecht, P J. Jupiter, M L. Shek, Daniel T. Pierce, Nils Swanson, Robert Celotta, I. Lindau, W E. Spicer

Surface Photoeffect in Small Spheres

September 15, 1982
Author(s)
David R. Penn, R W. Rendell
A new method is developed to calculate the photoabsorption and photoyield of small spheres. Numerical results are presented for the case of free-electron spheres for photon energies below the plasmon energies. It is found that the excitation of electron

Dispersion Relation Approach to the X-Ray Edge Problem

December 15, 1981
Author(s)
David R. Penn, S Girvin, G D. Mahan
We present a dispersion relation formulation of the open-line amplitude for the x-ray edge problem within the contact potential model. Using both multiple-scattering and determinant techniques, we find that to a very good approximation the many-body

Surface Enhanced Photoadsorption and Photoyield in Small Spheres

October 12, 1981
Author(s)
David R. Penn, R W. Rendell
Calculations of the photoabsorption and photyield of small metal spheres are reported for photon energies below the plasmon energy. It is found that the excitation of electron-hole paris due to the presence of the surface results in (1) enhancements in the

Resonant satellites in photoemission and Auger spectra of d-band metals

March 1, 1981
Author(s)
S Girvin, David R. Penn
Photoemission and Auger electron spectroscopy are powerful tools in the study of the electronic and magnetic properties of d band metals. In certain instances experimental spectra can be directly interpreted as a measure of some one body density of states

Polarized Low Energy Electron Diffraction (PLEED) from W(100)

February 15, 1981
Author(s)
G Wang, Robert Celotta, Daniel T. Pierce
A set of polarized low-energy-electon diffraction (PLEED) data from a W(100) surface measured using a polairzed electron beam is presented. The data include conventional LEED profilesI(E,θ) as well as S(Eθ profiles which measure the spin dependence of the

New Field Theory Formulation of Localized States in Disordered Systems

January 1, 1981
Author(s)
S Girvin, R W. Rendell, Garnett W. Bryant
We present a new field theoretic formulation of the quantum mechanics of disordered systems. The problem is converted to an explicit field theory by changing variables in the functional integral over all random potentials to an integral over all possible

Spin Dependence of Electronic Surface Resonance Scattering from W(100)

January 1, 1981
Author(s)
Daniel T. Pierce, Robert Celotta, G Wang, E McRae
In polarized low energy electron diffraction (PLEED) from W(100) at energies of 2 to 9 eV and incident angles 15 degrees < θ < 45 degrees, we observe a spin-splitting of the resonance sequence of peaks which converge on the (01) beam threshold. For θ > 26

Spin Dependence of the Electron Mean Free Path in Fe, Co, and Ni

December 22, 1980
Author(s)
R W. Rendell, David R. Penn
Spin-dependent electron mean free paths as a function of the hot electron energy are calculated for Fe, Co, and Ni. The difference in mean free paths of electrons for spin parallel and antiparallel to the majority spin direction of the ferromagnet is found
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