RELAXATION SHIFTS, SATELLITES AND SUM-RULES IN ELECTRON SPECTROSCOPIES OF ADSORBED ATOMS

Further ramifications of a recently proposed model treating the electronic relaxation processes associated with core level photoelectron spectroscopy of atoms or molecules adsorbed on metal surfaces are explored. Extra-atomic relaxation occurs via two mechanisms, displacement and excitation of surface plasmons (image potential screening) and substrate to adparticlc electron transfer into unfilled orbitals of the adparticle. Both processes are treated on an equal footing here. Model photoelectron spectra are presented for combinations of parameters likely to be relevant for real adsorbate- substrate systems and the relative importance of the two screening mechanisms is assessed. © 1979.