Affiliation: | 1. CIMAP, CEA/CNRS/ENSICAEN, Université de Caen Basse‐Normandie, Bd Henri Becquerel, BP 5133, F‐14070 Caen cedex 5 (France), Fax: (+33)?2‐31‐45‐47‐14;2. KVI Atomic and Molecular Physics, University of Groningen, Zernikelaan 25, 9747AA Groningen (The Netherlands);3. Laboratoire de Physique des Lasers, Institut Galilée, CNRS/Université Paris 13, 99 av. J. B. Clément, F‐93430 Villetaneuse (France) |