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Physics

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Displaying 1101 - 1125 of 1253

Calculations of Electron Inelastic Mean Free Paths (IMFPs) IV. Evaluation of Calculated IMFPs and of the Predictive IMFP Formula Tpp-2 for Electron Energies between 50 and 2000 eV

January 1, 1993
Author(s)
Shigeo Tanuma, Cedric J. Powell, David R. Penn
We have made additional evaluations of the electron inelastic mean free paths (IMFPs) and of the predictive IMFP formula TPP-2 presented in papers II and III of this series. Comparisons have been made with other formulae for the IMFPs and electron

Inverse Isotope Effects and Models for High-Tc Superconductivity

January 1, 1993
Author(s)
David R. Penn, Marvin Cohen, V Crespi
A model for high-temperature superconductivity with a mass-independent electronic mechanism in conjunction with a moderate amount of electron-phonon coupling has previously been shown to be inconsistent with experimental constraints on T c, the isotope

Inelastic Mean Free Paths of Low Energy Electrons in Solids

January 1, 1992
Author(s)
Shigeo Tanuma, Cedric J. Powell, David R. Penn
We present a summary of recent calculations of the electron inelastic mean free paths (IMFPs) of 50-2000 eV electrons in a group of 27 elements and 15 inorganic compounds. These calculations are based in part on experimental optical data to represent the

Anharmonic Phonons and the Isotope Effect in Superconductivity

January 1, 1991
Author(s)
V Crespi, Marvin Cohen, David R. Penn
Anharmonic interionic potentials are examined in an Einstein model to study the unusual isotope-effect exponents for the high-T(c) oxides. The mass dependences of the electron-phonon coupling constant λ and the average phonon frequency square-root <ω2> are

Spin Polarized Metastable Atom He De-excitation, Theory

January 1, 1991
Author(s)
David R. Penn, S Apell
Metastable spin-polarized He* atoms incident on a Ni surface undergo deexcitation in a process which yields electron from the Ni. The number produced is observed to depend on the relative spin of teh Ni and the He* atoms. The normalized difference in the

Electron Inelastic Mean Free Paths in Solids at Low Energies

January 1, 1990
Author(s)
Shigeo Tanuma, Cedric J. Powell, David R. Penn
We have calculated electron inelastic mean free paths (IMFPs) for 50-200 eV electrons in 31 materials (27 elements and 4 compounds). These calculations extend those previously reported for 200-2000 eV electrons in the same materials but avoid an

Limitations on Electronic Mechanisms for High Temperature Superconducting Oxides

January 1, 1990
Author(s)
David R. Penn, Marvin Cohen, I Barbee
The effects of electronic mechanisms for electron pairing in high temperature superconducting oxides on both the transition temperature T c and the isotope effect parameter α are considered. It is shown that for the higher T c oxides, measured values of T

Material Dependence of Electron Inelastic Mean Free Paths at Low Energies

January 1, 1990
Author(s)
Shigeo Tanuma, Cedric J. Powell, David R. Penn
We have calculated electron inelastic mean free paths (IMFPs) for 50-2000 eV electrons in 31 materials (27 elements and 4 compounds). We present and discuss in this paper IMFP data for aluminum and gold in the 50-2000 ev Range. Substantial differences are

The Chemisorption of Chlorosilanes and Chlorine on Si(111)7*7

January 1, 1990
Author(s)
Lloyd J. Whitman, S Joyce, J Yarmoff, F McFeeley, L Terminello
The chemisorption of SiCl 4, Si 2Cl 6, and chlorine on Si(111)7x7 has been characterixed using soft X-ray photoemission with synchrotron radiation, thermal desorption spectroscopy, and Auger electron spectroscopy. SiCl 4 dissociatively chemisorbs on room

Theory of Spin Polarized Metastable Atom De-excitation Spectroscopy; Ni-He

January 1, 1990
Author(s)
David R. Penn, S Apell
Metastable spin-polarized He* atoms incident on a Ni surface undergo deexcitation in a process which yields electrons from the Ni. The number produced is observed to depend on the relative spin of the Ni and the He * atoms. The normalized difference in the

Weak versus Strong Coupling Theory for Bi 2 Sr 2 CaCu 2 O 8

January 1, 1990
Author(s)
Marvin Cohen, David R. Penn
The latest optical determination of the superconducting-gap function for Bi 2Sr 2CaCu 2O 8 is consistent with weak-coupling theory. In contrast, a large discontinuity in heat-capacity data suggests strong-coupling superconductivity, and appears to exceed
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