The analysis of high resolution absorption spectra of the C2H2, C2D2, 13C2H2 and C2HD molecules in the region 1205–1255 Å has been achieved. The results, combined with available theoretical relations, have led to a complete interpretation of the features observed in that region in terms of several Renner-Teller interactions involving two close-lying electronic states, [Gtilde] and [Htilde], and the two bending vibrations of the molecule. Upper state parameters ε and ω, satisfying isotopic relations, are derived from the interpretation.
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Colin et al. (1979) studied this question.
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