1. The Department of Chemistry; University of Oxford, The Physical and Theoretical Chemistry Laboratory; South Parks Road Oxford OX1 3QZ UK
2. SAI Ltd; 9 Hadfield Street, Old Trafford Manchester M16 9FE UK
3. The Department of Physics; University of Oxford; Denys Wilkinson Building, Keble Road Oxford OX1 3RH UK
4. Physics Department; Brookhaven National Laboratory; Upton NY 11973 USA
5. The Department of Chemistry; University of Oxford, Chemistry Research Laboratory; 12 Mansfield Road Oxford OX1 3TA UK
6. Rutherford Appleton Laboratory; Didcot OX11 0QX UK