Intracavity Laser Absorption Spectroscopy of 13C16O2 near 734 nm

A. Bierret , Q. Desbois , J.-L. Martin (1) , S. Kassi (1) , S. A. Tashkun (2) , V. I. Perevalov (2) , A. Campargue (1)

1 LAME-LIPhy - LAsers, Molécules et Environnement
2 LTS - Laboratory of Theoretical Spectroscopy [Tomsk]

We report the first intensity measurements for the very weak 20052-00001 band of the 2ν1 + 5ν3 triad of 13C16O2 near 734 nm by high sensitivity Intracavity Laser Absorption Spectroscopy. A noise equivalent absorption αmin ˜ 2 × 10‑10 cm‑1 was achieved with an absorption pathlength equivalent to 50.3 km. The derived intensity values (on the order of 10‑28 cm/molecule) are found in good agreement with recent ab initio calculations. The dominant term of the effective dipole moment of the 2ν1 + 5ν3 triad was obtained from a fit of the measured line intensity values and used to generate the line list of the 2ν1 + 5ν3 triad of 13C16O2 and 12C16O2.

Domaines: Optique [physics.optics]

A. Bierret, Q. Desbois, J.-L. Martin, S. Kassi, S. A. Tashkun, et al.. Intracavity Laser Absorption Spectroscopy of 13C16O2 near 734 nm. Journal of Molecular Spectroscopy, 2014, 298, pp.38-42. ⟨10.1016/J.JMS.2014.02.005⟩. ⟨hal-01005762⟩