1. a Department of Chemistry , University of British Colombia , 2075 Wesbrook Place, Vancouver , British Columbia , Canada , V6T 1W5
2. b Standard Oil of California , San Francisco , California , U.S.A.
3. c Department of Materials Science , The University of Electro-Communications , Chofu-shi, Tokyo , 182 , Japan
4. d Ames Research Centre, NASA , Moffett Field , California , 94035 , U.S.A.