1. The Russian Academy of Sciences Institute of Physical Chemistry, 31 Leninsky Prospect, 117915 Moscow, Russia
2. The Russian Academy of Sciences Lebedev Physics Institute, 117924 Moscow, Russia
3. Hokkaido University Department of Nuclear Engineering, Sapporo 060, Japan
4. New Hydrogen Energy Laboratory, Institute of Applied Energy Sapporo 004, Japan
5. Osaka University Faculty of Nuclear Engineering, Osaka 565, Japan