1. Physical and Theoretical Chemistry
Laboratory, Oxford University, South Parks
Road, Oxford, U.K.
2. STFC, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U.K.
3. School of Biomedical Sciences, University of Ulster, Coleraine, Northern Ireland
4. Unilever Research and Development Laboratory, Port Sunlight, Quarry Road
East, Bebington, Wirral, U.K.
5. Institute Laue Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, Cedex
09, France