[1] Leiden Univ, Leiden Inst Chem, NL-2300 RA Leiden, Netherlands
[2] Scuola Int Super Studi Avanzati, Trieste, Italy
[3] CNR, INFM, Democritos Natl Simulat Ctr, Trieste, Italy
[4] Univ Helsinki, Dept Chem, Inorgan Chem Lab, FIN-00014 Helsinki, Finland