1. Department of Physics, Chalmers University of Technology, SE-41296 Göteborg, Sweden
2. Glass and Time, IMFUFA, Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
3. Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France
4. Insitute of Physics, University of Silesia, 75 Pulku Piechoty 1, 41-500 Chorzow, Poland
5. Department of Chemistry, Saarland University, 66123 Saarbrücken, Germany
6. Diamond Light Source, OX11 0DE Didcot, United Kingdom