1. School of Chemistry, University of East Anglia, Norwich NR4 7TJ, U.K.
2. Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
3. Department of Biophysics, Medical School, University of Pecs, Szigeti ut 12, 7624 Pecs, Hungary
4. Central Laser Facility, Research Complex at Harwell, Harwell Science and Innovation Campus, Didcot, Oxon OX11 0QX, U.K.