Abstract
Eighty-six vibronic subbands of the A ̃ - X ̃ system of C 2HD are assigned, in the conventional high-resolution absorption spectrum and in the jet-cooled laser fluorescence excitation spectrum, between 42 200 and 47 000 cm −1. Transitions involving all six normal modes of vibration in the A ̃ state are assigned, leading to the determination of an extensive set of vibrational parameters. Isotopic comparisons are used to predict still unknown vibrational frequencies in the A ̃ state of C 2H 2 and C 2D 2.
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