1. Department of Molecular and Mesoscopic Modelling, Institute of Chemical Process Fundamentals of the CAS, Prague, Czech Republic
2. Department of Physics, Faculty of Science, J. E. Purkinje University, Ústí n. Lab., Czech Republic
3. Weapons and Materials Research Directorate, U.S. Army Combat Capabilities Development Command Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005-5066, USA
4. Code 6189, Theoretical Chemistry Section, U.S. Naval Research Laboratory, Washington, DC 20375, USA