| Affiliation: | 1. Laser Center, Faculty of Physics, Mathematics and Optometry, University of Latvia, 19 Rainis blvd, Riga LV-1586, Latvia;2. Department of Chemistry, Lomonosov Moscow State University, Moscow, 119991, Leninskie gory 1/3, Russia;3. Faculty of Physics, Sofia University, 5 James Bourchier Boulevard, Sofia 1164, Bulgaria;1. Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland;2. Institute of Experimental Physics, Faculty of Physics, University of Warsaw, ul. Pasteura 5, 02-093 Warsaw, Poland |
