Knowledge Bank

We have generated MgNC in supersonic free jet expansions, and measured the laser induced fluorescence excitation spectra of the Mg-N-C bending vibronic bands of the $A~$ $2\Pi$ -- $X~$ $2\Sigma +$ transition. We analyzed $201$, $\kappa$ $2\Sigma (+)$ -- and $202$, $\kappa$ $2\Pi$ -- $2\Sigma +$ bands and $202$, $\mu$ $2\Pi 12$ -- $2\Sigma +$ sub-band. Through the molecular constants of the $A~$ (010) $\kappa$ $2\Sigma (+)$, (020) $\kappa$ $2\Pi$ and $\mu$ $2\Pi 12$ levels, the Renner-Teller vibronic structure on the $\nu 2$ bending mode in the $A~$ $2\Pi$ state has been characterized. To analyze the vibronic structure, we need to consider the anharmonic term.