1. Sincrotrone Trieste, in Area Science Park, I-34012 Basovizza (Trieste), Italy, CNR-IMIP, Montelibretti (Rome), I-00016 Italy, Laboratorio Nazionale TASC, INFM-CNR, 34012 Trieste, Italy, Laboratory of Quantum Chemistry, Irkutsk State University, 664003 Irkutsk, Russian Federation, Favorsky Institute of Chemistry, SB RAS, 664033 Irkutsk, Russia, and Theoretische Chemie, Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany