Cohen-Tannoudji, G. [P:(DE-HGF)0] ; Girardi, G. [P:(DE-HGF)0] ; Hayot, F. [P:(DE-HGF)0] ; Lacaze, R. [P:(DE-HGF)0] ; Morel, A. [P:(DE-HGF)0] ; Peschanski, R. [P:(DE-HGF)0]