1. Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
2. Department of Chemistry, University of Durham, Durham DH1 3LE, U.K.
3. Department
of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada
4. Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada
5. Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch
Road NW, Washington, D.C. 20015, United States
6. Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario L8S 4M1, Canada