par Vander Auwera, Jean 
Référence Journal of Molecular Spectroscopy, 201, 1, page (143-150)
Publication Publié, 2000-05
Référence Journal of Molecular Spectroscopy, 201, 1, page (143-150)
Publication Publié, 2000-05
Article révisé par les pairs
| Résumé : | 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. © 2000 Academic Press. |
