Correlations in electron-atom collisions involving polarised electrons andphotons

More sophisticated experimental methods to study inelastic electron{atom co llisions include polarisation-correlation measurements such as electron{pho ton (e, e gamma) and electron{electron (e, 2e) coincidence studies or stepw ise electron{photon (e gamma, gamma) correlations. Electron correlations an d spin erects can be explored on the most fundamental level in such experim ents. In this paper recent (e, e gamma) studies with Hg and Xe, (e gamma, g amma) studies with Ne and (e, 2e) studies with Xe using polarised electrons and/or polarised photons are reviewed.