[1] Institute of Industrial Science, University of Tokyo, 7-22-1 Roppongi, Minato-ku, Tokyo,106, Japan
[2] Department of Chemical Engineering, Faculty of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo,113, Japan
[3] JEOL Ltd., 1418 Nakagami-cho, Akishima, Tokyo,196, Japan