The Infrared Spectrum and Molecular Constants of Sulfur Dioxide

Abstract

By means of an infrared prism‐grating spectrometer equipped with a multiple‐path cell, seventeen vibration‐rotation absorption bands of SO2 have been observed and recorded. Seven bands exhibiting rotational structure were analyzed for the rotational constants of the upper and lower vibrational states. Harmonic and anharmonic constants in the vibrational energy expression have been calculated, and suitable values for the force constants in a four‐constant potential function have been obtained. No bands ascribable to S34O2 16 were found.