Oliver Steinbock1, Renate Wackerbauer2, Dezső Horváth3. 1. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, USA. 2. Department of Physics, University of Alaska, Fairbanks, Alaska 99775-5920, USA. 3. Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, Szeged H-6720, Hungary.