Spin-resolved Auger processes using arbitrarily polarized Synchrotron radiation

Within the framework of the two-step model we derive specific equations to characterize the intermediate singly ionized atomic state as well as the angular distribution and spin polarization of the Auger electrons where the incident photon beam can be arbitrarily polarized. Different experimental set-ups are discussed in detail. In particular, if the photon beam is 100% linearly polarized perpendicular to the reaction plane the Auger electrons become unpolarized and show an isotropic angular distribution within this plane. We introduce ionization parameters which allow for a factorization of the orientation and alignment parameters into the photoionization dynamics and the polarization state of the photons. Estimates are given for the case of the rare gases. The relative line intensities and a complete set of angular distribution and spin polarization parameters for the Xe M4.5N4.5N4.5 Auger spectrum have been calculated. With some physical assumptions. predictions for all components of the spin polarization vector become possible. Our results are compared to recent experimental data where good agreement is obtained.