We present high resolution Ag M5VV and M4VV Auger spectra obtained in coincidence with 3d5/2 and 3d3/2 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 ∼ 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 M5VV and M4VV line shapes are well described by the Cini-Sawatzky theory when it is applied separately to each component of the multiplet structure of the 4d85s2 Auger final state. A fit to the APECS data indicates that the correlation energy the 1G4 multiplet is 4.8±0.1eV. Furthermore, our analysis indicates that the missing intensity in the vicinity of the 3F4 multiplet in the Ag M5VV 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.
|Original language||English (US)|
|Number of pages||7|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 2001|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics