1. Department of Chemistry, M.V. Lomonosov Moscow State University, 1-3 Leninskie gory 119991 Moscow, Russian Federation
2. GIREDMET OJSC, 5-1 B. Tolmachevsky 119017 Moscow, Russian Federation
3. Department of Materials Science, M.V. Lomonosov Moscow State University, 1-73 Leninskie gory 119991 Moscow, Russian Federation
4. Institut für Experimentalphysik, Freie Universität Berlin, 14 Arnimallee D-14195 Berlin-Dahlem, Germany