Three body effects in low energy (e,2e) processes

Within the last two years a number of highly refined measurements have been performed on H targets which have yielded accurate absolute data for a range of energies and geometries[1] and it would appear that the experimental situation for this, the simplest of atomic targets is how resolved. The theoretical situation is however far from satisfactory and in this paper we will analysis some:of the main approaches and characterise their strengths and their weaknesses. We have developed a numerical method which allows us to evaluate triple differential cross sections(TDCS) using the most complex position dependent analytic ansatz wave fu;function and we will present results, using this for low energy (e,2e) processes. We will see that this approach fails when incident channel effects, such as target polarization are likely to be strong.