The C–N Stretching Vibronic Bands of the MgNC Ã2Π– X̃2Σ + Transition

Abstract

We have generated MgNC in supersonic free jet expansions and measured the laser-induced fluorescence excitation spectra of the C–N stretching vibronic bands of the à 2Π– X̃ 2Σ + transition. Rotational analysis yields the molecular constants of the vibronic levels, (1,0,0) and (1,0,1), in the à 2Π state. We cannot find any anomalies in the constants of these vibronic levels, while they are predicted to lie above the barrier of the isomerization reaction pathway, MgNC↔MgCN, on the à 2Π state. On the basis of the molecular constants obtained, we discuss the fine structures of both the ground X̃ 2Σ + and excited à 2Π states.