Line shape of the Ag M{sub 4,5}VV Auger spectra measured by Auger-photoelectron coincidence spectroscopy
We present high resolution Ag M{sub 5}VV and M{sub 4}VV Auger spectra obtained in coincidence with 3d{sub 5/2} and 3d{sub 3/2} core photoelectrons, respectively. Auger photoelectron coincidence spectroscopy (APECS) was used to separate these overlapping Auger lines and determine the intrinsic line shape of each spectrum. As the on-site Coulomb correlation energy U of Ag is comparable to twice the 4d bandwidth, 2W, (i.e., U/2W{approx}1), the coincidence Auger spectra exhibit both atomiclike and bandlike character. We find that whether considered separately or in combination, neither bandlike nor atomiclike line shapes give a satisfactory account of these Auger spectra. Instead, the intrinsic Ag M{sub 5}VV and M{sub 4}VV line shapes are well described by the Cini-Sawatzky theory when it is applied separately to each component of the multiplet structure of the 4d{sup 8}5s{sup 2} Auger final state. A fit to the APECS data indicates that the correlation energy the {sup 1}G{sub 4} multiplet is 4.8{+-}0.1eV. Furthermore, our analysis indicates that the missing intensity in the vicinity of the {sup 3}F{sub 4} multiplet in the Ag M{sub 5}VV Auger line, which has been noted in previous studies, results from a shift in the spectral weight of this multiplet component to higher kinetic energy, into the bandlike region of the spectrum.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205475
- Journal Information:
- Physical Review B, Vol. 63, Issue 15; Other Information: DOI: 10.1103/PhysRevB.63.155102; Othernumber: PRBMDO000063000015155102000001; 084112PRB; PBD: 15 Apr 2001; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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