1. Université-Paris Sud, Institut des Sciences Moléculaires
d’Orsay, Orsay, Bâtiment
351, Université Paris Sud, 91405 Orsay, France
2. CNRS, UMR 8214, Institut des Sciences Moléculaires d’Orsay, Orsay, Bâtiment 351, Université Paris
Sud, 91405 Orsay, France
3. CNR-IOM, s.s.14, km 163.5
in Area Science Park, 34012 Trieste, Italy
4. Departamento de Fisica, Universidad de Chile, Av. Blanco Encalada 2008, Santiago, Chile
5. Centro Atómico Bariloche-CNEA, Instituto Balseiro-UNC, CONICET, 8400 S.C. de Bariloche, Río Negro, Argentina
6. Dipartimento di Ingegneria ‘E. Ferrari’, Università di Modena e Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy
7. Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park, 2006, South Africa