The 4d edges of Ta, Pt, and Au were measured by means of reflection-electron energy-loss spectroscopy for different primary-beam energies E(p) in the maximum range 884 < E(p) < 2186 eV with the aim of investigating the nature of the electronic transitions involved at this edge. In order to allow a proper comparison of the measured edge intensities to each other, a normalization procedure was developed. On the basis of soft-x-ray-absorption spectroscopy data and by means of a theoretical muffin-tin generalized oscillator strength and differential cross-section calculations, it was possible to determine that nondipole d-d electron transitions are dominant at the 4d edges of all three elements. The observed edge-intensity decrease as a function of increasing atomic number is explained also on the basis of the amount of empty d-character states available at the Fermi level in each element.

NONDIPOLE TRANSITIONS AT THE 4D EDGES OF TA, PT, AND AU - THEORY AND EXPERIMENT

AGOSTINO, Raffaele Giuseppe;
1992

Abstract

The 4d edges of Ta, Pt, and Au were measured by means of reflection-electron energy-loss spectroscopy for different primary-beam energies E(p) in the maximum range 884 < E(p) < 2186 eV with the aim of investigating the nature of the electronic transitions involved at this edge. In order to allow a proper comparison of the measured edge intensities to each other, a normalization procedure was developed. On the basis of soft-x-ray-absorption spectroscopy data and by means of a theoretical muffin-tin generalized oscillator strength and differential cross-section calculations, it was possible to determine that nondipole d-d electron transitions are dominant at the 4d edges of all three elements. The observed edge-intensity decrease as a function of increasing atomic number is explained also on the basis of the amount of empty d-character states available at the Fermi level in each element.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/134537
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 2
  • ???jsp.display-item.citation.isi??? 3
social impact