Knowledge Bank

Analysis of new high resolution spectrograms of the $\beta 2\Sigma u+-X~2\Pi g$ transition of $CO2+$ (2900 {\AA}) has led to a more complete understanding of the rotational structure of the band at low quantum numbers. Various rotational perturbations and other irregularities in the p-type doubting of the $\beta 2\Sigma u+$ state can be explained if an interaction with a high vibrationa1 level of the $a2\Pi u$ state is assumed. These results are significant in the interpretation of fluorescence branching ratios in $CO2+$.