1. Department of Organic
and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku,
Tokyo 152-8552, Japan
2. Department of Polymer Science and Engineering, Graduate School of
Science and Engineering, Yamagata University, 4-3-16 Jonan, Yonezawa 992-8510, Japan
3. Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun,
Hyogo 679-5198, Japan