Knowledge Bank

The gas phase infrared emission spectrum of the $A3\Sigma --X3\Pi$ electronic transition of SiC has been observed using Fourier transform spectrometer. The SiC radical was generated by a d*** discharge in a flowing mixture of $(CH3)6Si2$ and He. Three bands $1-0(4577.8cm-1),0-0(3723.1cm-1)$ and $0-1(2769.8cm-1)$ have been observed, out of these the last two were observed for the first $timea$. Altogether more than 1100 transitions have been assigned and these data were simultaneously least squares fitted and obtained the molecular constants for SiC in the $A3\Sigma -$ and $X3\Pi$ electronic states. The vibrational frequency $\nu 0$ in the A state was determined to be $854.6994(7)cm-1$, which is close to the matrix $resultb854.2cm-1$.