1. Chemical Physics Laboratory, IFM Linköping University, S-581 83 Linköping, Sweden, Department of Applied Chemistry, Faculty of Engineering, Ehime University, Matsuyama 790-8577, Japan, Department of Molecular Biotechnology, Chalmers University of Technology, Lundberg Laboratory, P. O. Box 462, SE-405 30 Göteborg, Sweden, and Department of Applied Chemistry, Faculty of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan