1. J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-182 23 Prague, Czech Republic, Department of Chemistry and Centre for Materials Research, Queen Mary, University of London, Mile End Road, London E1 4NS, United Kingdom, Central Laser Facility, CCLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom, and Institute of Chemical Technology, Technická 5, 166 28 Prague, Czech Republic