1. Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada
2. European Synchrotron Radiation Facility, 6 rue Jules Horowitz, P. B. 220, 38043 Grenoble, France
3. Department of Chemistry, York University, 4700 Keele Street, Toronto, Ontario M3J 1P3, Canada