Investigation of auto-ionizing states in xenon by resonantly enhanced multi-photon ionization M. Stellpflug, M. Johnsson, I. D. Petrov and T. Halfmann Eur. Phys. J. D, 23 1 (2003) 35-42 Published online: 28 January 2003 DOI: 10.1140/epjd/e2003-00021-1