An IR spectroscopic study of liquid ozone and ozone dissolved in liquid argon

We have measured and interpreted the IR spectra of liquid ozone films at 78–85 K and ozone dissolved in liquid argon at 91–95 K. A less hindered rotation of ozone molecules in argon manifests itself as an intensity redistribution, caused by the Coriolis interaction, from the states ν3(B 1) and ν1 + ν3(B 1) to the states ν1(A 1) and 2ν1(A 1), respectively. The occurrence of wings in the contours of the bands ν1(A 1), 2ν1(A 1), and 2ν3(A 1) in liquid Ar and their absence in the spectrum of O3 also confirms the conclusion that the rotational motion of ozone molecules in an inert solvent at low temperatures is relatively less hindered. Maxima of ozone bands in Ar solution are shifted toward lower frequencies compared to those in the gas phase by 1–30 cm−1, which corresponds to the following shifts of harmonic frequencies of the molecule: Δω1 = −1.85(5) cm−1, Δω2 = −0.67(7) cm−1, Δω3=−7.20(5) cm−1. It was found that the absorption band of the ν3 mode in the spectrum of O3 in the liquid phase has a complicated asymmetric contour because of the resonance dipole-dipole interaction. The first and second spectral moments of this band have been determined to be M 1 = 1030.6 cm−1 and M 2 = 240.0 cm−2.