High sensitivity Cavity Ring Down spectroscopy of 18O enriched carbon dioxide between 5850 and 7000 cm-1: I. Analysis and theoretical modeling of the 16O12C18O spectrum - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Quantitative Spectroscopy and Radiative Transfer Année : 2013

High sensitivity Cavity Ring Down spectroscopy of 18O enriched carbon dioxide between 5850 and 7000 cm-1: I. Analysis and theoretical modeling of the 16O12C18O spectrum

Résumé

The room temperature absorption spectrum of highly 18O enriched carbon dioxide has been recorded by very high sensitivity CW-Cavity Ring Down spectroscopy between 5851 and 6990 cm-1 (1.71-1.43 μm). The achieved sensitivity (noise equivalent absorption αmin˜5×10-10-5×10-11 cm-1) has allowed the detection of more than 19,000 transitions belonging to eleven isotopologues of carbon dioxide. This first report is devoted to the analysis of the 16O12C18O data. A total of 6452 transitions belonging to 71 bands were rovibrationnally assigned on the basis of the predictions of the effective Hamiltonian model. For comparison, only twelve 16O12C18O bands were previously measured by Fourier Transform spectroscopy in the region. Line intensities of the weakest transitions are on the order of 2×10-29 cm/molecule. The studied spectral region is formed by ΔP=8, 9 and 10 series of transitions, where P=2V1+V2+3V3 is the polyad number (Vi are vibrational quantum numbers). The band-by-band analysis has allowed deriving accurate spectroscopic parameters of 69 bands from a fit of the measured line positions. A few resonance perturbations were identified. In particular, the 31112 (P=10) and 51105 (P=11) states belonging to different polyads are anharmonically coupled. The resulting intensity transfer leads to the observation of several extra lines of the 51105-01101 hot band which could be assigned.

Dates et versions

hal-00997513 , version 1 (28-05-2014)

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E. V. Karlovets, A. Campargue, D. Mondelain, S. Béguier, S. Kassi, et al.. High sensitivity Cavity Ring Down spectroscopy of 18O enriched carbon dioxide between 5850 and 7000 cm-1: I. Analysis and theoretical modeling of the 16O12C18O spectrum. Journal of Quantitative Spectroscopy and Radiative Transfer, 2013, 130, pp.116-133. ⟨10.1016/J.JQSRT.2013.05.019⟩. ⟨hal-00997513⟩

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