[1] Univ Complutense, Fac Quim, Dept Quim Fis, E-28040 Madrid, Spain
[2] Univ Oxford, Dept Chem, Phys & Theoret Chem Lab, Oxford OX1 3QZ, England
[3] Jilin Univ, Inst Atom & Mol Phys, Changchun 130012, Peoples R China
[4] Vrije Univ, LaserLaB, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands
[5] DRECEM SPAM CEA Saclay, Lab Francis Perrin, F-91191 Gif Sur Yvette, France