1. School of Chemistry University College Dublin Science Centre Belfield Dublin 4 Ireland
2. Current address: Technische Universität Kaiserslautern Fachbereich Chemie Erwin-Schrödinger-Strasse 52–54 67655 Kaiserslautern Germany
3. Current address: Nature Energy Ørbækvej 260 5220 Odense SØ Denmark
4. Univ Rennes CNRS, IPR (Institut de Physique de Rennes), UMR 6251 35000 Rennes France
5. National High Magnetic Field Laboratory Los Alamos National Laboratory Los Alamos NM 87545 USA
6. Current address: National High Magnetic Field Laboratory Tallahassee FL 32310 USA
7. Current address: City College of New York New York NY 10010 USA
8. Centre for Nanostructured Media School of Mathematics and Physics Queen's University of Belfast Belfast BT7 1NN, Northern Ireland UK
9. Current address: Cardiff University Cardiff CF10 3AT Wales UK
10. Department of Earth Sciences University of Cambridge Downing Street Cambridge CB2 3EQ UK