Correlations in Electron{Atom Collisions involving Polarised Electrons and Photons⁄

More sophisticated experimental methods to study inelastic electron{atom collisions include polarisation-correlation measurements such as electron{photon (e, e°) and electron{electron (e, 2e) coincidence studies or stepwise electron{photon (e°, °) correlations. Electron correlations and spin efiects can be explored on the most fundamental level in such experiments. In this paper recent (e, e°) studies with Hg and Xe, (e°, °) studies with Ne and (e, 2e) studies with Xe using polarised electrons and/or polarised photons are reviewed. 1