An O2+ primary electron collision ion source for the study of harpooning transitions at surfaces Back to all publications Publication date 1 January 1986 Reference H.C. Pan, T.C.M. Horn, P.H.F. Reijnen and A.W. Kleyn, An O2+ primary electron collision ion source for the study of harpooning transitions at surfaces, Port. Phys. 17, 215-237 (1986)