10min:

MASARU FUKUSHIMA AND TAKASHI ISHIWATA, Faculty of Information Sciences, Hiroshima City University, Asa-Minami, Hiroshima 731-3194, Japan.

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 -- X ^{2 +} transition. We analyzed 2₀¹, ² ^(+) -- and 2₀², ² -- ^{2 +} bands and 2₀², µ ² _\frac12 -- ^{2 +} sub-band. Through the molecular constants of the A (010) ² ^(+), (020) ² and µ ² _\frac12 levels, the Renner-Teller vibronic structure on the ₂ bending mode in the A ² state has been characterized. To analyze the vibronic structure, we need to consider the anharmonic term.