Showing papers by "Richard Landers published in 1998"
TL;DR: The sensitivity of XPS and Auger core level energies to the chemical environment promises a direct method for the determination of valence electronic changes in alloys involving noble metals as mentioned in this paper.
18 citations
15 Dec 1998
TL;DR: In this article, the authors compare relativistic and nonrelativistic atomic multiplet calculations with high-resolution experimental spectra excited with a Ti anode, indicating general, good agreement even for these open valence shell metals.
Abstract: We compare nonrelativistic atomic multiplet calculations of the ${L}_{1,2,3}{M}_{4,5}{M}_{4,5}$ spectra of Rh and Pd in the jj intermediate-coupling scheme with high-resolution experimental spectra excited with a Ti anode, indicating general, good agreement even for these open valence shell metals: the simplicity of the calculations indicates their suitability for experimental analyses. Comparison with relativistic calculations, including configuration interaction, for Rh indicates that the nonrelativistic spectra appear to agree better with the experimental data than do the relativistic ones. The influence of relativistic and correlation effects on the intensities does not seem to be important. The major influence on the forms of the spectra is that of the relative positions of the multiplet components. Satellites of all three spectra would seem to be produced by shake-up, rather than Coster-Kronig processes. The positions and forms of these satellites are consistent with a model in which spectator vacancies in the $4d$ band exist in both the initial and final states of the Auger transition.
8 citations
TL;DR: In this article, the results of high-resolution measurements of these levels in Nb, Mo, Ru, Rh, Pd, Ag, In, Sn and Sb were presented.
8 citations
TL;DR: In this article, the results of high-resolution measurements of several high energy LMN and LMM Auger spectra of Pd, Ag, In, Sn and Sb excited with Ti-Kα radiation are compared with the results from atomic transition probability calculations, which indicates the reliability of such calculations as they proceed from open to closed 4d shell metals.
5 citations
TL;DR: In this article, the L 2, 3 M 4, 5 M 4, 5 M4, 5 Auger spectrum of Ag, Pd and Rh excited by bremsstrahlung also has satellite features and manifest experimental systematics consistent with 4 d spectator vacancies produced by shake-up.
5 citations
TL;DR: In this article, the same experimental equipment was used to derive information about the unoccupied portion of the surface density of states from a characteristic loss spectroscopy, in particular, from core-level inelastic electron-scattering spectroscope (CLIESS).
Abstract: Information about the occupied portion of the surface density of states of materials can be derived from electron-excited Auger electron spectroscopy (AES), which is a standard experimental technique in most surface science laboratories. Surface sensitive experimental techniques that provide information regarding the unoccupied portion of the surface density of states are often not standard and are not so readily available. Here we explore the possibility of utilizing the same experimental equipment as in AES to derive information about the unoccupied portion of the surface density of states from a characteristic loss spectroscopy, in particular, from core-level inelastic electron-scattering spectroscopy (CLIESS). An important application of this technique is in comparative studies. CLIESS spectra from clean surfaces of aluminum, beryllium and nickel are presented. These data were taken in the first-derivative mode using the reflection of monoenergetic primary beams of 450 eV energy for Be, and 300 eV for...
3 citations