1. Institut
des Sciences Moléculaires d’Orsay, Université-Paris Sud, 91405 Orsay, France
2. CNRS, UMR
8214,
Institut des Sciences Moléculaires d’Orsay, ISMO, Bâtiment 351, Université Paris Sud, 91405 Orsay, France
3. Synchrotron SOLEIL,
L’Orme des Merisiers, Saint-Aubin,
BP 48, F-91192 Gif-sur-Yvette
Cedex, France
4. Dipartimento
di Ingeneria ‘E. Ferrari’, Università di Modena e Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy
5. IOM-CNR, Science Park, 34149 Basovizza Trieste, Italy
6. Department
of Physics, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa