1. Institute of Experimental Physics, TU Bergakademie Freiberg, Leipziger Street 23, 09596 Freiberg, Germany
2. Samara National Research University, Moskovskoye Shosse 34, Samara 443086, Russia
3. Samara State Technical University, Molodogvardeyskaya Ulitsa, 224, 443001 Samara, Russia
4. Institute of Ion Beam Physics & Materials Research, Helmholtz-Zentrum Dresden-Rossendorf e.V. (HZDR), Bautzner Landstraße 400, 01328 Dresden, Germany