L.A. Bulavin - Academician NAS of Ukraine, Dr. Sc. (Phys.-Mat.), Professor, Head of Molecular and Medical Physics Department, Physics Faculty, Taras Shevchenko National Universty of Kyiv. E-mail: bulavin221@gmail.com Yu.F. Zabashta - Dr. Sc. (Phys.-Mat.), Professor, Molecular and Medical Physics Department, Physics Faculty, Taras Shevchenko National Universty of Kyiv. E-mail: zabashta@maial.univ.kiev.ua L.Yu. Vergun - Ph. D. (Phys.-Mat.), Research Scietist, Molecular and Medical Physics Department, Physics Faculty, Taras Shevchenko National Universty of Kyiv. E-mail: aktanl@yahoo.com A.V. Kaspova - Ph. D. (Phys.-Mat.), Research Scientist, Molecular and Medical Physics Department, Physics Faculty, Taras Shevchenko National Universty of Kyiv. E-mail: kasprova.a@gmail.com O.S. Svechnikova - Ph. D. (Phys.-Mat.), Senior Research Scientist, Molecular and Medical Physics Department, Physics Faculty, Taras Shevchenko National Universty of Kyiv