1. Applied Materials Technology Center, Technology Division, Panasonic Corporation, 3-4 Hikaridai, Seika-cho, Soraku-gun, Kyoto 619-0237, Japan
2. Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
3. Extreme Energy-Density Research Institute, Nagaoka University of Technology, Nagaoka, Niigata 940-2188, Japan
4. Opto-Energy Research Center, Depatment of Materials Science & Engineering, Yamaguchi University, Yamaguchi 755-8611, Japan
5. Nordic Hysitron Laboratory, School of Chemical Engineering, Aalto University, Aalto 00076, Finland