1. Laboratoire de Photophysique Moléculaire du CNRS, Bâtiment 213, Université de Paris-Sud, 91405-Orsay, France
2. Institute of Physics, Leningrad University, St-Petersburg Peterhof 198904, Russia
3. Novosibirsk Institute of Organic Chemistry, Russian Academy of Science, Novosibirsk 630090, Russia