Infrared Spectrum of S16O18O and the Potential Constants of SO2

Abstract

An investigation of the infrared spectrum of S¹⁶O¹⁸O results in the following frequency assignment: $${\nu }_1\text{=1122±1\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}}{\mathrm{,\hspace{0.17em}\hspace{0.17em}\nu }}_2\text{=506.8±0.5\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}}{\mathrm{,\hspace{0.17em}\hspace{0.17em}\nu }}_3\text{=1341±0.5\hspace{0.17em}}{\mathrm{cm}}^{\text{−1}}.$$ These data combined with the fundamental frequencies of S¹⁶O₂ have been used to calculate the potential constants for sulfur dioxide. These are $$f_d{\text{=10.02,\hspace{0.17em}\hspace{0.17em}f}}_{\mathrm{dd}}\text{=0.03,\hspace{0.17em}\hspace{0.17em}}\frac{1}{d}{f}_{\mathrm{d\alpha }}\text{=0.20,\hspace{0.17em}\hspace{0.17em}}\frac{1}{d^2}{f}_{\alpha }\text{=0.793.}$$