1. Department of Micro Engineering, Kyoto University, Kyoto-daigaku-katsura, Nishikyo, Kyoto 615-8540, Japan
2. Laboratory of Aerosols Chemistry and Physics, Institute of Chemical Process Fundamentals of the CAS, v. v. i., Suchdol, Prague 6 165 02, Czech Republic
3. Department of Physics, Faculty of Science, J. E. Purkinje University, Ústí nad Labem 400 96, Czech Republic