1. School of Chemistry; University of Nottingham; Nottingham NG7 2RD United Kingdom
2. Department of Physics; University of Strathclyde; SUPA, 107 Rottenrow East Glasgow G4 0NG Scotland United Kingdom
3. STFC Rutherford Appleton Laboratory; Central Laser Facility; Harwell Campus Didcot OX11 0QX United Kingdom