1. Faculty of Physics and International Laser Center, Lomonosov Moscow State UniversityLeninskie Gory 1/62Moscow 119991Russia
2. Institute of Spectroscopy of the Russian Academy of SciencesFizicheskaya Str., 5, TroitskMoscow 108840Russia
3. Department of Quantum Chemistry, Mendeleev University of Chemical TechnologyMiusskaya Square 9Moscow 125047Russia