1. Department of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, UK (C.A.F.); Spectroscopy Products Division, Renishaw plc, Old Town, Wotton-under-Edge, Gloucestershire, GL12 7DW, UK (I.P.H.); and Eindhoven University of Technology, PO 513, 5600 MB, Eindhoven, The Netherlands (J.L.)