High sensitivity CRDS of the a1DgX3Sg band of oxygen near 1.27 µm: Extended observations, quadrupole transitions, hot bands and minor isotopologues - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Quantitative Spectroscopy and Radiative Transfer Année : 2010

High sensitivity CRDS of the a1DgX3Sg band of oxygen near 1.27 µm: Extended observations, quadrupole transitions, hot bands and minor isotopologues

Résumé

The CW-Cavity Ring Down Spectroscopy (CW-CRDS) technique has been used to record the high sensitivity absorption spectrum of the a1Dg–X 3Sg band of oxygen near 1.27 µm. The spectra were obtained between 7640 and 7917cm1 with ‘‘natural'' oxygen and with a sample highly enriched in 18O. Theabsolute intensities of 376 and 643 oxygen transitions were measured in the two spectra. They include the a1DgX 3Sg (0–0) bands of 16O2, 16O18O, 16O17O, 17O18O and 18O2. The (0–0) bands of 16O2 and 18O2 show weak quadrupole transitions with line intensities ranging from 11030 to 1.91028 cm/molecule. They are accompanied by the a1DgX 3Sg (1–1) hot bands, which are reported for the first time. The line profiles of the transitions of the 16O17O and 17O18O isotopologues were observed to be broadened due to an unresolved magnetic hyperfine structure. Accurate spectroscopic parameters of the different energy levels involved in the observed bands were derived from a global fit of the observed line positions, combined with microwave and Raman measurements available in the literature.
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Dates et versions

hal-00563120 , version 1 (07-02-2011)

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Citer

Olga Leshchishina, Samir Kassi, I. E. Gordon, L. S. Rothman, Wang Le, et al.. High sensitivity CRDS of the a1DgX3Sg band of oxygen near 1.27 µm: Extended observations, quadrupole transitions, hot bands and minor isotopologues. Journal of Quantitative Spectroscopy and Radiative Transfer, 2010, 111, pp.2236. ⟨10.1016/j.jqsrt.2010.05.014⟩. ⟨hal-00563120⟩

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