1. Department of Chemistry and Chemical Engineering Chalmers University of Technology 412 96 Gothenburg Sweden
2. European Synchrotron Radiation Facility 38043 Grenoble Cedex 9 France
3. Johnson Matthey Technology Centre Blounts Court RG4 9NH Sonning Common, Reading UK
4. Johnson Matthey AB 421 31 Västra Frölunda Sweden