1. School of Engineering and Built Environment; Glasgow Caledonian University; Cowcaddens Road Glasgow G4 0BA UK
2. Department of Chemistry; University of Delhi; Delhi - 110007 India
3. Department of Chemistry; University of Zurich; Winterthurerstrasse 190 CH-8057 Zurich Switzerland
4. HORIBA Jobin Yvon IBH Ltd; 133 Finnieston Street Glasgow G3 8HB UK