High-resolution spectroscopy of H 2SO 4, HDSO 4, and D 2SO 4 vapor in the region 1200–10,000 cm −1

Abstract

The high-resolution (0.05 cm −1) spectra of gas-phase H 2SO 4, HDSO 4, and D 2SO 4 were measured over the frequency region 1200–10,000 cm −1 using Fourier-transform infrared spectroscopy. The increased resolution of this work compared with previous studies has lead to an improved vibrational analysis of H 2SO 4. This study has answered unresolved questions about combination bands and overlapping features from previous gas-phase spectroscopic studies of H 2SO 4 and marks the first experimental measurement of the ν 8 and ν 15 torsional vibrations in this molecule. This work leads to a brief discussion on vibrational mode mixing in sulfuric acid.