1. Laser Research Center, Faculty of Physics, Vilnius University 1 , Sauletekio Ave. 9, LT-10222 Vilnius, Lithuania
2. Institute of Chemical Physics, Faculty of Physics, Vilnius University 2 , Sauletekio Ave. 9, LT-10222 Vilnius, Lithuania
3. Biomedical Physics Laboratory, National Cancer Institute 3 , P. Baublio Str. 3b, LT-08406 Vilnius, Lithuania
4. Department of Chemical and Physical Sciences, University of Toronto Mississauga 4 , 3359 Mississauga Rd., Mississauga, Ontario L5L 1C6, Canada
5. Department of Physics, University of Toronto 5 , 60 St. George St. Toronto, Toronto, Ontario M5S 1A7, Canada