1. Karlsruhe Institute of Technology, Institute for Nuclear
Waste Disposal, P.O. Box 3640, 76021 Karlsruhe, Germany
2. Department of Chemistry, Oxford University, South Parks Road, Oxford OX1 3QR, U.K.
3. European Synchrotron Radiation Facility (ESRF), 6 Rue Jules Horowitz, BP 220, 38043 Grenoble Cedex 9, France
4. Department of Physics, University of Washington, Seattle, Washington 98195, United States
5. Department
of Geosciences, University of Hamburg, Grindelallee 48, 20146 Hamburg, Germany