1. Department of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
2. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
3. Faculty of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warszawa, Poland
4. STFC ISIS Facility, Rutherford Appleton Laboratory, Chilton Didcot, Oxfordshire OX11 OQX, U.K.
5. School of Electronic Engineering and Computer Science, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.