Photoemission from the Drude absorption

A theory for the photoemission from an electron gas due to the Drude energy absorption is presented. The theory, for both p- and s-polarized incident light, is based upon the three-step photoemission model and exhibits significant effects of the second-order matrix elements involved. Photoyields, energy distributions, angular distributions, and energy-resolved angular distributions are obtained. The energy distributions are roughly triangular and there are striking asymmetries in the angular distributions. It is argued that there is a strong suppression of the p-polarized yield for frequencies such that the local dielectric function is slightly negative.