Rotational absorption of some asymmetric rotor molecules: Part I. Ozone and sulfur dioxide

• Published in: Journal of molecular spectroscopy Vol. 19; no. 1; pp. 7 - 24
• Main Authors: Gebbie, H.A., Stone, N.W.B., Topping, G., Gora, E.K., Clough, S.A., Kneizys, F.X.
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 1966
• ISSN: 0022-2852; 1096-083X
• DOI: 10.1016/0022-2852(66)90225-6

Far infrared spectra of ozone and sulfur dioxide have been obtained interferometrically with a resolution of 0.25 and 0.12 cm −1, respectively. In the case of ozone, agreement with predictions based on previously published microwave data has been confirmed. For sulfur dioxide, the far infrared data indicate the need of taking higher order centrifugal distortion corrections into consideration. Joint use of the far infrared and of published microwave data has made it possible to determine an improved set of molecular rotation constants including four sixth- and one eighth-order centrifugal distortion parameters. A semiclassical theory of higher order centrifugal distortion effects is developed which permits interpretation of some of the empirical results obtained in terms of the usual harmonic valence force constants. Agreement between observed and calculated contours is further improved by inclusion of plansible line width variations in the calculations. High internal consistency is obtained.