1. Contribution from the Faculty of Chemistry, University of Gdańsk, Sobieskiego 18, 80-952 Gdańsk, Poland, Academic Computer Center in Gdańsk TASK, Technical University of Gdańsk, ul. Narutowicza 11/12, 80-952 Gdańsk, Poland, and Institute of Physics, Nicholas Copernicus University, ul. Grudziadzka 5, 87-100 Toruń, Poland