1. Department of Physical Chemistry and Materials Science Interdisciplinary Excellence Centre University of Szeged Rerrich Square 1 Szeged H-6720 Hungary
2. Institute for Solid State Physics and Optics Wigner Research Centre for Physics Konkoly-Thege Miklós út 29-33 Budapest H-1121 Hungary
3. Department of Analytical Chemistry University of Pannonia Egyetem u. 10 Veszprém 8200 Hungary