1. Department of ChemistryMcGill University 801 Sherbrooke St. W. Montreal H3A 0B8 Canada
2. Department of Chemistry and Polymer ScienceStellenbosch University Private Bag X1 Matieland, Stellenbosch 7602 South Africa
3. Bruker-AXS 5465 E Cheryl Pkwy Fitchburg WI 53711 USA
4. Department of Physics and AstronomyState University of New York, Stony Brook Stony Brook, New York 11794-3800 USA