1. Department of ChemistryDalhousie University 6274 Coburg Road Halifax B3H 4R2 Canada
2. Division of Chemistry and Chemical EngineeringCalifornia Institute of Technology 1200 E California Blvd. Pasadena CA-91125 USA
3. Joint Center for Artificial PhotosynthesisCalifornia Institute of Technology 1200 E California Blvd. Pasadena CA-91125 USA