1. Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland
2. Institut für Physikalische und Theoretische Chemie, Goethe-Universität, Max-von-Laue-str. 7, 60438 Frankfurt am Main, Germany
3. Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States