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Träfflista för sökning "L773:1098 0121 srt2:(1981-1984)"

Sökning: L773:1098 0121 > (1981-1984)

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1.
  • Petersson, L.-G., et al. (författare)
  • Hydrogen desorption versus electronic structure studies on Ag covered Pd with photoemission and a hydrogen sensitive MOS structure
  • 1984
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 30, s. 3055-
  • Tidskriftsartikel (refereegranskat)abstract
    • With a hydrogen-sensitive Pd metal-oxide-semiconductor structure we have investigated how Ag overlayers affect the hydrogen adsorption and desorption properties of Pd. By varying the concentration of Ag in the top layer, we have continuously changed the distribution of d states close to the Fermi energy as determined by photoemission. For moderate amounts of Ag, only blocking of active hydrogen sites on the Pd surface occurs and no effects due to the variation in the electronic density of states can be detected.
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2.
  • Rapp, Östen, et al. (författare)
  • The pressure dependence of of the electron-phonon interaction and the normal state resistivity
  • 1981
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - : American Physical Society. - 1098-0121 .- 1550-235X. ; 24:1, s. 144-154
  • Tidskriftsartikel (refereegranskat)abstract
    • Accurate measurements of the electrical resistance as a function of temperature and pressure are reported for Sn, Zr, dhcp La, and V. These measurements cover a temperature region around room temperature and pressures up to 1.3 GPa. From these data, including also our previous measurements for Al and published results for Pb, the pressure dependence of d ρ / dT (the resistivity-temperature derivative) is obtained. This quantity is found to be a significant factor in the pressure dependence of the electron-phonon interaction parameter λ. For the nontransition metals the relative pressure dependence of d ρ / dT is much larger than the compressibility. Therefore the pressure dependence of the superconducting Tc is quantitatively well accounted for by the resistance data for these metals. For the transition metals the pressure dependence of d ρ / dT is relatively smaller and Tc(p) calculated from the resistance data is, at the best, only qualitatively correct. These differences are discussed. Estimates for the pressure dependence of the plasma frequency are obtained.
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3.
  • von Barth, Ulf, et al. (författare)
  • Dynamical effects in X-ray spectra and the final-state rule
  • 1982
  • Ingår i: Physical Review B (Condensed Matter and Materials Physics). - 1098-0121. ; 25:8, s. 5150-5179
  • Tidskriftsartikel (refereegranskat)abstract
    • The dynamical theory of X-ray spectra due to Nozieres and De Dominicis (ND, 1969) is evaluated here numerically for numerous model systems including cases where the core-hole potential possesses a bound state. It is shown that the resulting emission spectra obey the final-state rule rather accurately. An approximate but analytical derivation of this rule is given which provides insight into the mechanisms leading to the final-state rule. The evaluations are performed with the use of two methods, one based on an integral equation together with a separable core-hole potential and the other based on determinantal wave functions for a finite number (N) of electrons in a box. The equivalence of the two methods is demonstrated both formally and numerically. By comparing them the authors prove the finite-N approach to be accurate already for rather small N. They also show that a separable potential does not give rise to any spurious results but can actually be chosen to yield the same ND spectrum as a local potential. The ND theory of X-ray photoemission spectra is discussed and from calculations of the exponent function α(ω) for several model systems closely corresponding to simple metals the authors conclude the equivalence of this theory and its asymptotic approximation as far as the extraction of asymmetry indices is concerned. Recent criticism of the major conclusions reached here and in previous work is refuted.(61 refs)
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