IONIZATION IN SLOW COLLISIONS OF PROTONS WITH ATOMIC OXYGEN J.P. Hansen, L. Kocbach and I. Ladadwa Department of Physics, University of Bergen, Allegaten 55, N-5007 Bergen, Norway Cross sections for single electron ionization, capture and excitation in slow proton-oxygen collisions are calculated by the two center atomic orbital expansion close-coupling method. The transition probabilities are constructed from a one-electron independent particle approximation.