Abstract
RuO4 is a heavy tetrahedral molecule which has practical uses for several industrial fields. Due to its chemical toxicity and the radiological impact of its 103 and 106 isotopologues, the possible remote sensing of this compound in the atmosphere has renewed interest in its spectroscopic properties. New, higher resolution FTIR spectra have been recorded at room temperature, using an isotopic pure sample of 102RuO4 and a sample with all stable isotopes present in natural abundance. We reinvestigate here the strong ν3 stretching fundamental region and perform new assignments and effective Hamiltonian parameter fits for the five main isotopologues (99RuO4, 100RuO4, 101RuO4, 102RuO4 and 104RuO4), by considering the ν3 stretching mode as an isolated band. We provide precise effective Hamiltonian parameters, including band centers and Coriolis interaction parameters. We discuss isotopic shifts and estimate the band centers for the two minor isotopologues (97RuO4 and 98RuO4) and the two radioactive isotopologues (103RuO4 and 106RuO4). Experimental band strengths for the two IR active fundamentals are also reported for the first time.
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