Rovibrational spectra of SO2-containing van der Waals complexes in the v1 region of SO2. Part II. SO2–H2O and SO2–D2O

Abstract

Jet-cooled rovibrational absorption spectra of SO2–H2O and SO2–D2O complexes have been measured in the v1 symmetric stretching region of SO2 around 1151 cm−1 using a segmented rapid-scan quantum cascade laser spectrometer. The rovibrational spectrum of SO2–D2O has also been measured in the v2 bending region of D2O around 1178 cm−1. The tunneling splittings caused by the internal rotation of the water unit could not be resolved under our experimental conditions. The observed rovibrational transitions for these two complexes are analyzed using a standard A-reduced Watson asymmetric top Hamiltonian, yielding precise molecular constants for the excited vibrational states. The experimental band-origins are 1156.713866(70) cm−1 for SO2–H2O and 1156.819797(66) cm−1 for SO2–D2O in the v1 region of SO2, and 1180.177901(58) cm−1 for SO2–D2O in the v2 region of D2O.