Two body loss rate in a magneto-optical trap of metastable He A. Browaeys, J. Poupard, A. Robert, S. Nowak, W. Rooijakkers, E. Arimondo, L. Marcassa, D. Boiron, C. I. Westbrook and A. Aspect Eur. Phys. J. D, 8 2 (2000) 199-203 Published online: 15 February 2000 DOI: 10.1007/s100530050027