Knowledge Bank

The $A~3\Pi i-X~3\Sigma -$ band of the CCO radical has been reinvestigated by means of near-infrared diode laser spectroscopy with Doppler-limited resolution. The absorption spectrum was measured in the regions of $11607-11919cm-1,11960-12011cm-1$, and $12340-12389cm-1$, corresponding to the $(000)-(000)$, $(010)-(010)$ and $(010)3\Sigma$ $(-)-(000)3\Sigma$- bands. The $(000)-(000)$ band has been analyzed to obtain detailed molecular constants for $A~(000)3\Pi i$ state including A -- type doubling $constants1$. In addition, numerous perturbations, accompanied by intensity anomalies in some cases, have been found in the $Q=0$ and 1 sublevels of the $A~3\Pi i(000)$ state in the present study. Analysis of the $(010)-(010)$ and $(010)3\Sigma (-)--(000)3\Sigma$- bands yielded molecular constants for both the $A~(010)$ and $X~(010)$ states, including Renner parameters in the $A~(010)$ state and 1-type doubling constant in the $X~(010)$ state.