1. Department of Chemistry, Tulane University, 6400 Freret Street, New Orleans,
Louisiana 70118-5698, United States
2. Department of Chemistry and
Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, United States
3. Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36,
D-45470 Mülheim an der Ruhr, Germany
4. EPSRC National UK EPR Facility
and Service, Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.