Abstract
We report the first intensity measurements for the very weak 20052-00001 band of the 2ν1+5ν3 triad of 13C16O2 near 734nm by high sensitivity Intracavity Laser Absorption Spectroscopy. A noise equivalent absorption αmin∼2×10−10cm−1 was achieved with an absorption pathlength equivalent to 50.3km. The derived intensity values (on the order of 10−28cm/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.
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