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Absolute Intensities Measurements in the ν4 + ν5 Band of 12C2H2: Analysis of Herman–Wallis Effects and Forbidden Transitions

✍ Scribed by J. Vander Auwera

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
169 KB
Volume
201
Category
Article
ISSN
0022-2852

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✦ Synopsis

We measured absolute line intensities in two bands of 12 C 2 H 2 near 7.5 m, namely the 4 ϩ 5 (⌺ u ϩ )-0(⌺ g ϩ ) and 4 ϩ 5 (⌬ u )-0(⌺ g ϩ ) 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 4 ϩ 5 (⌬ u )-0(⌺ g ϩ ) 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: ᐉ-type resonance and Coriolis interaction. In the case of the 4 ϩ 5 (⌺ u ϩ )-0(⌺ g ϩ ) band, the influence of ᐉ-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 ᐉ ϭ 1 levels. We did not observe the 4 ϩ 5 (⌺ u Ϫ )-0(⌺ g ϩ ) band, consisting only of a Q branch, in agreement with Watson's prediction.

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