1. Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan
2. School of Chemistry Northeast Normal University Changchun Jilin 130024 P. R. China
3. Ångström Laboratory Physical Chemistry Uppsala University 75120 Uppsala Sweden
4. Department of Applied Chemistry Osaka University Osaka 565-0871 Japan
5. Research Institute for Energy Conservation National Institute of Advanced Industrial Science and Technology Tsukuba 305-8564 Japan