Abstract
The (0,0) band of the C∼2Πr − X̃2Σ+ system of LaNH was studied by LIF spectroscopy in a free-jet apparatus. The subbands, C∼2Π3/2 − X̃2Σ+ and C∼2Π1/2 − X̃2Σ+ were rotationally analyzed. Local perturbations were observed in f-parity levels of both spin components of the C∼ state which suggests presence of two 2Σ+/− perturber states. Dispersed fluorescence (DF) from the C∼2Π state suggests vibronic coupling in the C∼ state to a nearby 2Σ+ state. A low-lying Ã′2Δr electronic state was identified in the DF spectra with the Ω = 5/2 and 3/2 components lying respectively at 8353 and 7648 cm−1.
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