1. Department of Chemistry, Johannes Gutenberg-University Mainz, D-55128 Mainz, Germany
2. O.O. Galkin Donetsk Institute for Physics and Engineering, NAS of Ukraine, Kyiv - Kharkiv 03028, Ukraine
3. B.I. Verkin Institute for Low Temperature Physics and Engineering, NAS of Ukraine, Kharkiv 61103, Ukraine
4. Institute for Condensed Matter Physics and Laboratory for Emergent Nanometrology, TU Braunschweig, D-38106 Braunschweig, Germany