a
Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK
E-mail: a.iraqi@sheffield.ac.uk
;
Fax: +44 (0)114 222 9303
;
Tel: +44 (0)114 222 9566
b
Chemistry Department, King Abdulaziz University, P. O. Box 80203, Jeddah 21589, Saudi Arabia
c
Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK
E-mail: d.g.lidzey@sheffield.ac.uk
;
Fax: +44 (0)114 222 3555
;
Tel: +44 (0)114 222 3501