The Absorption Spectrum of Cyanogen Gas in the Ultraviolet

The absorption spectrum of cyanogen gas has been investigated in the ultraviolet down to $\lambda 1800$. In the region $\lambda \lambda 2300-1820$ more than one hundred bands were found which apparently belong to one system with origin probably at 44900 ${\mathrm{cm}}^{-1\mathrm{}}$. The bands have a pronounced tendency to appear as doublets. The more intense ones are usually broad with edges toward the violet, but many line-like structures appear which are probably $Q$ branches. Some regularities in the spectrum are pointed out and the relation of the ultraviolet spectrum to the infrared absorption and Raman spectrum is briefly discussed.