Le spectre d'absorption du dioxyde de carbone dans le proche infrarouge (1.4-1.7 µm) : Cavity Ring Down Spectroscopy, modélisation globale et bases de données

Abstract : The CW-CRDS spectra of natural and 13C-enriched carbon dioxide in the 5851-7045 cm−1 region were analysed including the previously investigated 6130-6750 cm−1 region which was re-examined in order to reduce the fraction of unassigned lines. About 8000 line positions belonging to eight CO2 isotopologues (12C16O2, 13C16O2, 16O12C18O, 16O12C17O, 16O13C18O, 16O13C17O, 13C18O2, 17O13C18O) were newly measured with estimated accuracy of 1 × 10−3 cm−1. Only about 5% of lines, mostly very weak ones, remained unassigned in the 5851-7045 cm−1 region. The rovibrational parameters were retrieved for a total of 238 bands belonging to eight CO2 isotopologues which correspond to a total of 213 vibrational upper states. A number of resonance intersections perturbing upper states were observed and identified. The newly observed line positions were added to the input datasets in order to refine the effective Hamiltonian parameters for six CO2 isotopologues. The fitted sets of effective Hamiltonian parameters reproduce the line positions from all involved experimental sources close to their experimental uncertainties. The line strengths of 2039 and 952 transitions were measured for 13C16O2 and 12C16O2 isotopologues in the1.6 µm region. In the case of the principal isotopologue (12C16O2) the most part of the measured intensities belong to weak perpendicular and "forbidden" bands. The present results were gathered with the selected intensity data reported in the literature for this region in order to refine the effective dipole moment parameters by least-squares fitting. The fitted sets of effective dipole moment parameters reproduce the line intensities from all involved experimental sources within their uncertainties. Four occurrences of interpolyad resonance interaction were evidenced in this work for the first time in the case of carbon dioxide. The present work makes an important contribution in the development of the CDSD and HITRAN databases for carbon dioxide.
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Boris Perevalov. Le spectre d'absorption du dioxyde de carbone dans le proche infrarouge (1.4-1.7 µm) : Cavity Ring Down Spectroscopy, modélisation globale et bases de données. Atomic Physics [physics.atom-ph]. Université Joseph-Fourier - Grenoble I, 2009. English. ⟨tel-00600074⟩

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