1. CNRS, UMR 8523—PhLAM—Physique des Lasers, Atomes et Molécules, Université de Lille, F-59000 Lille, France
2. DTU Chemistry—Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark
3. Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States