1. Department of Chemistry, The University of Tennessee, Knoxville, Tennessee 37996, United States
2. Max Planck Institute for Chemical Energy Conversion, Stiftstraße
34-36, D-45470 Mülheim
an der Ruhr, Germany
3. Institute of General
and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
4. Quantum Condensed
Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States