Direct measurement of fine structure changing collisional losses in cold trapped 85Rb L. G. Marcassa, R. A.S. Zanon, S. Dutta, J. Weiner, O. Dulieu and V. S. Bagnato Eur. Phys. J. D, 7 3 (1999) 317-321 Published online: 15 October 1999 DOI: 10.1007/s100530050574