1. Department of Chemistry and Biochemistry, Eastern Washington University, Cheney, Washington 99004, United States
2. Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794, United States
3. Clarendon Laboratory, Department of Physics, Oxford University, Oxford OX1 3PU, U.K.
4. ISIS Pulsed-Muon Facility, Rutherford-Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, U.K.
5. Department of Chemistry, University of Copenhagen, Copenhagen DK-2100, Denmark
6. Hochfeld-Magnetlabor Dresden (HLD), Forschungszentrum Dresden-Rossendorf (FZD), D-01314 Dresden, Germany
7. Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, United States