High-resolution infrared spectroscopy and analysis of the v2=v4 bending dyad and v3 stretching fundamental of ruthenium tetroxide

International audienceRuO4 is a heavy tetrahedral molecule which has practical uses for several industrial fields. Due to its chemicaltoxicity and the radiological impact of its 103 and 106 isotopologues, the possible remote sensing of this compound in theatmosphere has renewed interest in its spectroscopic properties. We investigate here for the first time at high resolutionthe bending dyad region in the far IR and the line intensities in the 3 stretching region. Firstly, new high resolutionFTIR spectra of the bending modes region in the far infrared have been recorded at room temperature, using a speciallyconstructed cell and an isotopically pure sample of 102RuO4. New assignments and effective Hamiltonian parameterfits for this main isotopologue have been performed, treating the whole 2=4 bending mode dyad. We provide preciseeffective Hamiltonian parameters, including band centers and Coriolis interaction parameters. Secondly, we investigatethe line intensities for the strongly infrared active stretching mode 3, in the mid infrared window near 10 m. New highresolution FTIR spectra have also been recorded at room temperature, using the same cell and sample. Using assignmentsand effective Hamiltonian parameter for 102RuO4, line intensities have been retrieved and the dipole moment parametersfitted for the 3 fundamental. A frequency and intensity line list is proposed