J. Phys. IV France 09 (1999) Pr6-157-Pr6-160
Line shape of the Ag N23W Auger spectrum measured by Auger-photoelectron coincidence spectroscopyR.A. Bartynski1, Q. Qian1 and S.L. Hulbert2
1 Department of Physics and Astronomy and Laboratory for Surface Modification, Rutgers University, P.O. Box 849, Piscataway, NJ 08855, U.S.A.
2 National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11972, U.S.A.
We present Ag N3VV and N2VV Auger spectra obtained in coincidence with 4p3/2 and 4p1/2 core photoelectrons, respectively. We have also obtained the 4p3/2 and 4p1/2 core level spectra in coincidence with N3VV and N2VV Auger electrons. As the on-site Coulomb correlation energy of Ag, U, is comparable to the 4d band width, W, the coincidence Auger spectra exhibit aspects of both atomic-like and band-like components. We find a surprisingly large ~ 30% of the spectral weight of 2-hole decays is in the band-like region. Furthermore, the Auger spectra have large low energy tails that are atrributed to nonradiative decays involving more than two electrons. In the coincidence core level spectra, the large (> 5 eV) lifetime broadening is eliminated, leaving a width of 2.5 eV associated with the Auger lifetime. This sharp peak in the coincidence photoemission spectrum resides on a broader feature owing to the properties of the Auger transitions.
© EDP Sciences 1999