1. Department
of Physical
Chemistry, Babes-Bolyai University, RO-400028 Cluj-Napoca, Romania
2. Department of Physics, Budapest University of Technology and Economics, H-1521 Budapest,
Hungary
3. School
of Chemistry, University of Leeds, Leeds LS2 9JT,
U.K.
4. Penn State Berks College, The Pennsylvania State University, Reading, Pennsylvania
19610, United States