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Complementary cavity-enhanced spectrometers to investigate the OH + CH combination band in trans-formic acid

par Golebiowski, Dariusz ;Foldes, Tomas ;Vanfleteren, Thomas ;Herman, Michel ;Perrin, Agnès
Référence Journal of Chemical Physics, 143, 014201
Publication Publié, 2015-07-07

Article révisé par les pairs

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Résumé :

We have used continuous-wave cavity ring-down and femto-Fourier transform-cavity-enhanced absorption spectrometers to record the spectrum of the OH-stretching + CH-stretching (ν1 + ν2) combination band in trans-formic acid, with origin close to 6507 cm-1. They, respectively, allowed resolving and simplifying the rotational structure of the band near its origin under jet-cooled conditions (Trot = 10 K) and highlighting the overview of the band under room temperature conditions. The stronger B-type and weaker A-type subbands close to the band origin could be assigned, as well as the main B-type Q branches. The high-resolution analysis was hindered by numerous, severe perturbations. Rotational constants are reported with, however, limited physical meaning. The ν1 + ν2 transition moment is estimated from relative intensities to be 24°away from the principal b-axis of inertia.