1. JEOL Ltd., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan
2. Department of Materials Science and Engineering, School of Materials and Chemical Technologies, Tokyo Institute of Technology, 4259 Nagatsuta,
Midoriku, Yokohama 226-8503, Japan
3. JST PREST, 4259 Nagatsuta, Midoriku, Yokohama 226-8503, Japan