Photoassociation experiments with ultracold metastable helium J. Kim, U. D. Rapol, S. Moal, J. Léonard, M. Walhout and M. Leduc Eur. Phys. J. D, 31 2 (2004) 227-237 Published online: 26 October 2004 DOI: 10.1140/epjd/e2004-00144-9