Autoionization of an ultracold Rydberg gas through resonant dipole coupling T. Amthor, J. Denskat, C. Giese, N. N. Bezuglov, A. Ekers, L. S. Cederbaum and M. Weidemüller Eur. Phys. J. D, 53 3 (2009) 329-335 Published online: 10 April 2009 DOI: 10.1140/epjd/e2009-00119-4