Knowledge Bank

It is found that if one assumes vibronic mixing of the $A-2A2$ and $X-2B1$ states of $C102$ by $\nu 3(b2)$, with a coupling constant of $1500cm-1$, observed vibrational levels in both states and some unusual transition probability observations can be modelled. The model is therefore applied also to the $A-2B2$ and $X-2A1$ states of $NO2$, for which vibronic interaction has been suspected for the past 15 years. The coupling constant for $NO2$ is $1000cm-1$. It is predicted that the unidentified $302$ band of the $A-2B2-X-2A1$ transition of $HO2$ is seven times as strong as the $302$ band, and that it lies $2470cm-1$ above the (also unidentified) D-D band.