1. Queen Mary University of London, School of Biological and Chemical Sciences, Mile End Road, London E1 4NS (UK)
2. Beckman Institute, California Institute of Technology, Pasadena, CA 91125 (USA)
3. Central Laser Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX (UK)
4. Laboratoire de Spectroscopie Ultrarapide, ISIC, FSB‐BSP, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne‐Dorigny (Switzerland)
5. Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853 (USA)
6. J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague (Czech Republic)