On the Absorption Spectrum of Sulphur Dioxide

Abstract

An attempt to organize the absorption bands of sulphur dioxide in the region 3900-2600A has been made. The (000)″ - (000)′ transition $\lambda 3129.5\mathrm{A}$ (31,945 ${\mathrm{cm}}^{-1\mathrm{}}$) has been definitely located from a study of the temperature behavior of the lower frequency bands. Two of the vibrational frequencies known in the normal state have been observed and the intervals between successive lower levels determined. One of the frequencies in the excited state has been definitely assigned and a tentative value has been assigned for a second frequency. The configuration of the excited molecule is discussed.