1. Department of Chemical Engineering Stanford University 443 Via Ortega Stanford CA 94305 USA
2. Department of Chemistry Stanford University 443 Via Ortega Stanford CA 94305 USA
3. SSRL SLAC National Accelerator Laboratory 2575 Sand Hill Rd Menlo Park CA 94025 USA
4. Present Address: Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology 76131 Karlsruhe Germany