1. Polymer Institute of the Slovak Academy of Sciences; Dúbravská cesta 9 845 41 Bratislava Slovakia
2. International laser centre; Ilkovicˇova 3 841 04 Bratislava Slovakia
3. Department of Chemical Engineering; Dupuis Hall, Queen's University; Kingston Ontario K7L 3N6 Canada
4. Institute of Physical Chemistry; University of Goettingen; Tammannstraße 6 37077 Goettingen Germany