1. Department
of Chemistry, University of Reading, Whiteknights, Reading, RG6 6AD, United Kingdom
2. ISIS
Facility, Rutherford Appleton Laboratory, Harwell, Oxford, Didcot, OX11 0OX, United Kingdom
3. Laboratoire CRISMAT, UMR 6508 CNRS ENSICAEN, 6 bd Maréchal Juin, 14050 CAEN cedex 4, France