The Magnetic Rotation Spectra of SO2and CS2in the Ultraviolet

The apparatus previously used for the study of magnetic rotation spectra in the visible and infra-red has been modified for use in the ultraviolet. The object was to see whether the simplification often found in magnetic rotation spectra will help in the analysis of the complicated spectra associated with electronic transitions of polyatomic molecules, most of which occur in the ultraviolet. The spectra of this type which have been found are those of C${\mathrm{S}}_2$, S${\mathrm{O}}_2$ and formaldehyde. In each case the band spectrum is replaced by sharp lines which may readily be correlated to band heads. These spectra occur for only limited regions of the absorption spectrum, in which the band heads are rather sharp and present a regular appearance. In the region where the band heads are irregular and confused in appearance, no effect occurs. In no case is the magnetic rotation spectrum sufficiently extensive to permit a vibrational analysis of the band system to be made, nor to give any material aid in its analysis.