MEASUREMENTS OF REFLECTED ELECTRON-ENERGY-LOSS SPECTROMETRY AND X-RAYPHOTOELECTRON-SPECTROSCOPY SPECTRA FOR DERIVATIONS OF THE ENERGY-LOSSFUNCTION AND SOURCE FUNCTION FOR AU 4F PHOTOELECTRONS

An energy loss function for keV electrons from Au has been derived fro m reflected electron energy loss spectrometry spectra using a Landau f ormula modified to account for elastic scattering. The influence of th e latter was analyzed using Monte Carlo analysis, The energy loss func tion was verified by using it for background subtraction of the Au 4f x-ray photoelectron spectroscopy spectrum according to Tougaard's meth od. This approach led to a more reasonable source function, characteri zed by two satellite peaks. Herman-Skillman atomic orbital calculation , based on the Xa approximation, suggests these might correspond to sh ake-up peaks associated with the Au 6s-->7s transition. (C) 1995 Ameri can Vacuum Society.