1. Department of Chemistry, The University of Sheffield, Dainton Building, Brook Hill, Sheffield, S3 7HF, UK
2. School of Physics and Astronomy, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
3. Department of Physics and Astronomy, The University of Sheffield, Hicks Building, Hounsfield Road, Sheffield, S3 7RH, UK
4. Cambridge Photon Technology, J. J. Thomson Avenue, Cambridge, CB3 0HE, UK
5. Cavendish Laboratory, Cambridge University, J. J. Thomson Avenue, Cambridge, CB3 0HE, UK
6. Diamond Light Source Ltd, Harwell Science & Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
7. John Owens Building, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK