1. Department of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, U.K., School of Biological and Chemical Sciences, Walter Besant Building, Queen Mary, University of London, Mile End Road, London E1 4NS, U.K., Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K., ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, U.K., Berlin Neutron Scattering Center, Hahn-Meitner-Institut, Glienicker Strasse 100, D-14109 Berlin, Germany, and School of Physics...