1. Department of Chemistry, University of New Brunswick, P.O. Box 4400, Fredericton, N.B. E3B 5A3, Canada, Department of Health and Human Sciences, London Metropolitan University, 166-220 Holloway Road, London N7 8D8, U.K., Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM-II), Technische Universität München, D-85747 Garching, Germany, CNR-ISTM, Istituto di Scienze e Tecnologie Molecolari, via C. Golgi 19, 20133 Milano, Italy, and Lehrstuhl für Chemische Physik und Materialwissenschaften, Universität...