1 Laboratoire de Chimie Physique, UMR 8000, CNRS, Université Paris-Sud, Bât. 349, 15 avenue Jean Perrin, F-91403 Orsay, France. aurelien.de-la-lande@u-psud.fr.
2 Departament de Química Física i Analítica, Universitat Jaume 1, 12071 Castelló, Spain. moliner@uji.es.
3 Department of Chemistry, Centre for Molecular Simulation and Institute for Quantum Science and Technology, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4. dennis.salahub@ucalgary.ca.