Photoelectron spectra of core electrons from palladium—silver alloys

Abstract

For a number of PdAg alloys the photoelectron spectra of the core electrons are studied in a systematical way. The role of the so-called extrinsic and intrinsic losses, satellite structures, and lineshapes is to be discussed for 3p and 3d lines. Existing theories are discussed for the given cases. A multi-electron mechanism for explaining satellite structures is proposed. Asymmetry of the Pd 3d lines is studied and a strong dependence on the density of states a t the Fermi energy is found.Fur eine Anzahl von PdAg-Legierungen werden die Photoelektronenspektren systematisch untersucht. Die Rolle der sogenannten extrinsischen und intrinsischen Verluste, der Satellitenstrukturen und der Linienform wird fur die 3p-und die 3d-Linien diskutiert. Einige der vorhandenen Theorien werden mit den experimentellen Ergebnissen verglichen. Ein Vielelektronen-Anregungsmechanismus wird zur Erklarung der Satellitenstruktur bei Pd vorgeschlagen. Die Asymmetrie der Pd 3d-Linien wird studiert und eine starke Abhangigkeit von der Znstandsdichte an der Fermienergie gefunden. John et al. [a]have extended the scattering concept to Bloch electrons being scattered by the core hole potential. The muffin-tin method has been used to calculate the phase shifts. Their concept works well for transition metals.Concerning theoretical work dealing with the occurrence of line asymmetry, satellites, and structure a t the high-energy side of the photoelectron lines the papers of Kaga, Kotani, and Tojozawa [5,6] and the series of papers of Grebennikov et al. [7] should be mentioned. Multi-electron excitations as shake-up processes have been discussed, among others, by Nemoshkalenko and Aleshin [S]. For the discussion and application of the "sudden approximation" to the core hole creation process the paper of Meldner and Perez [9] is recommended. l ) DDR 8027 Dresden, DDR. 2, DDR 402 Halle (Saale), DDR.

Soft X‐Ray Appearance Potential Spectra of Iron–Cobalt Alloys

“…Thus we are led to P2p3i2(Fe)= 1.1 eVand r2, 3,2(C0)= = 0.9 eV. For definition of rE see [28]. Assuming Lorentzian lines the theoretical isochromates were convoluted by a common line with a being above-mentioned lifetime halfwidth T = r2p3,2 + ht-l, ht-l Table 1 gives the estimated lifetime broadening of the final states of Fe, Co, and Ni using corrected values for the AA'.…”

Research of Mechanical Properties of Random Disordered CuNi Alloys

“…The thermal properties of individual constituent elements are different from the alloys [8][9][10][11][12][13]. Any composition of CuNi alloys can be formed because of strong miscible character of Cu and Ni atoms and thus formed random disordered alloys.…”

Fine structure of unoccupied Agdstates near the Fermi level in Ag and AgPd studied by high-resolution partial Auger yield spectroscopy at the AgL3edge

“…Also, the calculated total DOS below E F in Ag metal and Ag 0.5 Pd 0.5 does not exhibit the pronounced double structure observed in the XPS data. 5,12 A closely related theoretical method has recently been applied 13 to study the charge transfer effects in AgPd alloys. The calculated L 3 absorption spectra only extend up to 3 eV above the Fermi level.…”