THE CN VIOLET ABSORPTION SPECTRUM OBSERVED DURING THE FLASH PHOTOLYSIS OF BrCN

Abstract

High resolution absorption spectra of the $^{2}\Sigma\rightarrow ^{2}\Sigma$ CN violet system have been taken during the flash photolysis of BrCN vapor in excess argon. Accurate measurements of the $\Delta v=0$ and $-1$ sequences have been made and molecular constants derived for the $0\leq v^{\prime}^{\prime}\leq 6$ and $0\leq v^{\prime}\leq 7$ levels. The results suggest that certain experimental modifications would allow the difficult CN “tail band” spectra (7 $\leq v^{\prime}^{\prime}\leq 12$ to be observed and rotationally analyzed.