1. School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, UK.
2. Department of Computer Science, Merchant Venturers Building, Woodland Road, Bristol BS8 1UB, UK.
3. Photon Ultrafast Laser Science and Engineering (PULSE) Institute and Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
4. SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
5. School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK.
6. Central Laser Facility, Research Complex at Harwell, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Oxford, Didcot, Oxfordshire OX11 0QX, UK.