1. Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
2. Center for Materials Research by Information Integration (CMI2) Research and Services Division of Materials Data and Integrated System (MaDIS), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
3. Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya 456-8587, Japan
4. Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
5. Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
6. Department of Chemistry, School of Science, Tokyo Institute of Technology, Tokyo 152-8551, Japan
7. Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
8. CREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan