1. University of Helsinki, Department of Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland, Accelerator Laboratory, P.O. Box 43, FIN-00014 University of Helsinki, Finland, Department of Chemistry, University of Liverpool, Liverpool, L69 3ZD, United Kingdom, Epichem Limited, Power Road, Bromborouigh, Wirral, Merseyside, CH62 3QF, United Kingdom, and Freescale Semiconductor, Inc., Advanced Products Research and Development, 3501 Ed Bluestein Blvd., Austin, Texas 78721