We have measured the M4,5 edge in Ag, Pd, and Rh by means of reflection electron-energy-loss spectroscopy (REELS) and compare the results with x-ray-absorption spectra and theoretical calculations. It is not possible to interpret the results obtained by REELS on the basis of dipole selection rules. We explain this behavior as a combined effect of the non-negligible momentum transfer during the excitation process and the high density of the dipole-forbidden final states. We conclude that the interpretation of REELS excited-core-level spectra is more complicated than for the corresponding x-ray-absorption data and requires, in general, a joint experimental and theoretical effort.

M-4,5 ABSORPTION-EDGE OF AG, PD, AND RH BY REFLECTION ELECTRON-ENERGY-LOSS SPECTROSCOPY - ROLE OF NONDIPOLE TRANSITIONS

AGOSTINO, Raffaele Giuseppe
1991

Abstract

We have measured the M4,5 edge in Ag, Pd, and Rh by means of reflection electron-energy-loss spectroscopy (REELS) and compare the results with x-ray-absorption spectra and theoretical calculations. It is not possible to interpret the results obtained by REELS on the basis of dipole selection rules. We explain this behavior as a combined effect of the non-negligible momentum transfer during the excitation process and the high density of the dipole-forbidden final states. We conclude that the interpretation of REELS excited-core-level spectra is more complicated than for the corresponding x-ray-absorption data and requires, in general, a joint experimental and theoretical effort.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/139577
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