Correlation and autoionization in Silicide Auger spectra

We measured the Auger CVV lineshape in nickel and chromium silicides and computed the corresponding two-particle spectra. A reasonable agreement between the measured and calculated spectra is obtained if correlation effects are taken into account. The autoionization contribution to the CVV Auger lines in chromium and in chromium silicides was also determined by comparing X-ray-excited spectra with electron-excited spectra and by studying the losses in the absorption edge region.