Abstract
We measured absolute line intensities in two bands of 12C2H2 near 7.5 μm, namely the ν4 + ν5(Σ+u)–0(Σ+g) and ν4 + ν5(Δu)–0(Σ+g) bands, using Fourier transform spectroscopy with an accuracy estimated to be better than 2%. Using theoretical predictions from Watson [J. K. G. Watson, J. Mol. Spectrosc. 188, 78 (1998)], the observation of the forbidden ν4 + ν5(Δu)–0(Σ+g) band and the Herman–Wallis behavior exhibited by its rotational lines were studied quantitatively in terms of two types of interactions affecting the levels involved by the band: ℓ-type resonance and Coriolis interaction. In the case of the ν4 + ν5(Σ+u)–0(Σ+g) band, the influence of ℓ-type resonance is also confirmed. We also attributed the intensity asymmetry observed between the R and P branches of that latter band to a Coriolis interaction with ℓ = 1 levels. We did not observe the ν4 + ν5(Σ−u)–0(Σ+g) band, consisting only of a Q branch, in agreement with Watson's prediction.
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