1. Physical Chemistry 1, Chemical Center, Lund University, P.O. Box 124, S-221 00 Lund, Sweden
2. Department of Physical Chemistry, Division of Materials Science and Chemical Engineering, Faculty of Engineering, Yokohama National University, Tokiwadai 156, Hodogaya-ku, Yokohama 240, Japan
3. Max-Planck-Institut für Biophysikalische Chemie, Postfach 2841, D-37018 Göttingen, Germany