1. Institut
Charles Gerhardt, UMR 5253 CNRS Université Montpellier, cc 1501,
Place E. Bataillon, 34095 Montpellier, France
2. Centre
for Theoretical and Computational Chemistry (CTCC), Department of
Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
3. Department
of Chemistry, University of York, York YO10 5DD, United Kingdom