Affiliation: | a Institute of Physics, TU-Ilmenau, D-98684 Ilmenau, P.O. Box 100565, Germany b Kyiv National Shevchenko University, Volodymyrska Str., 64, 01033 Kyiv, Ukraine c Institute of Physical Chemistry of NAS of Ukraine, pr. Nauky, 31, 03028 Kyiv, Ukraine d CNRS-UMR 8609, University Paris XI, France |