1. Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada
2. Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
3. Department of Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
4. Department of Physics, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
5. Materials Science Division, Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan