1. STFC, Daresbury Laboratory, Daresbury, Warrington, Cheshire WA4 4AD, UK
2. Institute for Advanced Computational Science, Stony Brook University, Stony Brook, New York 11794-5250, USA
3. Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 166 28 Prague, Czech Republic
4. Laboratoire de Spectroscopie Ultrarapide, Ecole Polytechnique Fédérale de Lausanne, ISIC, FSB, CH-1015 Lausanne, Switzerland
5. ISM-CNR, Istituto di Struttura dei Materiali, LD2 Unit, 34149 Trieste, Italy
6. IOM-CNR, Istituto Officina dei Materiali, 34149 Trieste, Italy
7. Elettra-Sincrotrone Trieste S.C.p.A., S.S. 14 km 163,5 in Area Science Park, I-34012 Basovizza, Trieste, Italy
8. Department of Chemistry, 20 Gordon Street, London, WC1H 0AJ, UK