Photo induced collisions with laser cooled He* atoms H. C. Mastwijk, M. van Rijnbach, J. W. Thomsen, P. van der Straten and A. Niehaus Eur. Phys. J. D, 4 2 (1998) 131-137 Published online: 15 November 1998 DOI: 10.1007/s100530050192