1. Institute of Synthetic Polymeric Materials of Russian Academy of Sciences, Profsoyuznaya st. 70, 117393 Moscow, Russia
2. Faculty of Physics & International Laser Center, Lomonosov Moscow State University, 119991 Moscow, Russia
3. Institute
of Physics, University of Siegen, Emmy-Noether-Campus, Walter-Flex-Str. 3, D-57068 Siegen, Germany
4. Chemistry Department, Moscow State University, Leninskie
Gory 1-3, Moscow 119991, Russia