[1] Univ Montpellier, CNRS, ENSCM, UMR 5253,Inst Charles Gerhardt Montpellier, Pl E Bataillon, R-34095 Montpellier 05, France
[2] Univ Estadual Campinas, Inst Phys Gleb Wataghin, BR-13083970 Campinas, SP, Brazil
[3] Univ Lyon, CNRS, Inst Recherches Catalyse & Environnement Lyon, 2 Av A Einstein, F-69626 Villeurbanne, France
[4] Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA