1. School of Chemistry, University of Leeds, Leeds LS2 9JT, United Kingdom
2. School of Mathematics, University of Bristol, Fry Building, Woodland Road, Bristol BS8 1UG, United Kingdom
3. Quantemol Ltd., 320 City Road, The Angel, London EC1V 2NZ, United Kingdom
4. Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom