1. National University of Science and Technology MISIS, Moscow, Leninsky pr. 4, Moscow 119049, Russia
2. Institute of Microelectronics Technology and High Purity Materials, Russian Academy of Sciences, 6 Academician Ossipyan Str., Chernogolovka, Moscow Region 142432, Russia
3. Valiev Institute of Physics and Technology, Russian Academy of Sciences, Nahimovsky Ave, 36(1), Moscow, 117218, Russia
4. Laboratory of Radiation Technologies, A. N. Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences, Moscow 119071, Russia
5. Joint Institute for Nuclear Research, Joliot-Curie 6, Dubna, Moscow Region, 141980, Russia
6. Department of Physics, Centre for Materials Science and Nanotechnology, University of Oslo, N-0316 Oslo, Norway
7. Department of Materials Science and Engineering, University of Florida, Gainesville, FL 32611, USA