1. Department of Chemistry, 3000 Broadway, Columbia University, New York, New York 10027, Chemistry Department, 2900 Bedford Avenue, Brooklyn College of CUNY, Brooklyn, New York 11210, Center for Nanolithography Research, Rochester Institute of Technology, 82 Lomb. Memorial Drive, Rochester, New York 14623; SEMATECH, Austin, Texas 78741, and Freescale Semiconductor, Centre de Recherche, 870 rue Jean Monnet, Crolles, France