1. a Department of Chemistry , University of Sheffield , England
2. b Institute of Basic Problems in Chemistry, University of Warsaw , ul. Pasteura 1, 02-093 , Warszawa , Poland
3. c Service de Spectroscopie Moléculaire en milieu condensé, Laboratoire de recherches Physiques , Université P. et M. Curie , Tour 22, 4 Place Jussieu, 75230 , Paris Cedex 05 , France