1. Department of Chemistry, Missouri University of Science and Technology, Rolla, MO 65409, USA
2. Department of Chemistry, University of California, One Shields Avenue, Davis, California 95616, USA
3. Department of Physics, Missouri University of Science and Technology, Rolla, MO 65409, USA
4. Institute of Physics, Czech Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic
5. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA