Rotationally induced Penning ionization of ultracold photoassociated helium dimers J. Léonard, A. P. Mosk, M. Walhout, M. Leduc, M. van Rijnbach, D. Nehari and P. van der Straten Europhys. Lett., 70 2 (2005) 190-196 Published online: 16 March 2005 DOI: 10.1209/epl/i2005-10004-8