1. Department of Chemistry, University of Calgary, Calgary, AB, Canada T2N 1N4, Department of Molecular Spectroscopy, Chemical Research Center of the Hungarian Academic of Sciences, P.O. Box 17, H-1525 Budapest, Hungary, Research Institute of Chemical and Process Engineering, Faculty of Information Technology, University of Pannonia, P.O. Box 158, H-8201 Veszprém, Hungary, and Department of Chemistry, University of Alberta, Edmonton, AB, Canada T6G 2G2