1. Université de Bordeaux, Groupe de Spectroscopie Moléculaire, Institut des Sciences Moléculaires, UMR CNRS 5255, 351 Cours de la Libération, F-33405 Talence, France, Hahn-Meitner Institute, BENSC, Glienickerstrasse 100, D-14109 Berlin, Germany, School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, England, School of Chemistry, Cardiff University, Park Place, Cardiff CF10 3AT, Wales, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada, and Institut Laue...