1. Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
2. European Theoretical Spectroscopy Facility (ETSF),
3. Laboratoire de Chimie et Physique Quantiques, CNRS, Université de Toulouse, UPS, 118 route de Narbonne, F-31062 Toulouse, France
4. Polimero eta Material Aurreratuak: Fisika, Kimika eta Teknologia saila, Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), and Donostia International Physics Center (DIPC), P.K. 1072, 20080 Donostia, Spain
5. Departamento de Química Física, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Spain