1. Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
2. Thomas Young Centre, University College London, Gower Street, London, WC1E 6BT, UK
3. Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
4. Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK