1. Laboratoire de
Spectroscopie Ultrarapide (LSU) and Lausanne Centre for Ultrafast
Science (LACUS), École Polytechnique Fédérale de Lausanne, ISIC, FSB, CH-1015 Lausanne, Switzerland
2. Dipartimento
di Fisica e Chimica, Università degli Studi di Palermo, Via
Archirafi 36, 90123 Palermo, Italy
3. School
of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom