Photoelectron Diffraction

Abstract

So far in this volume, we have neglected a seemingly obvious effect in PES, namely the scattering of the photoexcited electron on its way through the crystal to the surface, by the crystal potential. This is a straightforward scattering problem leading to intensity modulations as a function of electron wavelength and/or crystal orientation. Such intensity modulations have indeed been observed and the method of measuring PES in order to bring out most clearly the scattering features of the final-state electron intensity is called PhotoElectron Diffraction (PED).