ELECTRON IMPACT EXCITATION - IONIZATION OF HELIUM : (e, 2e) Pascale Marchalant+, J.Rasch++, Colm T.Whelan++ and H.R.J.Walters* +Institut fur Theoretische Physik, Universitat Frankfurt D-60054 Frankfurt, Germany. ++Department of Applied Mathematics, University of Cambridge, Cambridge CB3 9EW, UK. *Department of Applied Mathematics, Queen's University, Belfast BT7 1NN, UK. Accurate first Born calculations of (e, 2e) excitation - ionization of He to He+(n=2) will be presented. These calculations employ large coupled - pseudostate expansions for the final state wave function representing the ejected electron moving in the field of He+(n=2).