1. Takasaki Branch, Advanced Science Research Center, Japan Atomic Energy Agency, Takasaki 370-1292, Japan, L. V. Kirensky Institute of Physics, SB RAS, 660036 Krasnoyarsk, Russian Federation, N. M. Emanuel Institute of Biochemical Physics of RAS, 119334 Moscow, Russian Federation, and Ames National Laboratory/Department of Chemistry, Iowa State University, Ames, Iowa 50011