Empirical line parameters of methane in the 1.63–1.48 μm transparency window by high sensitivity Cavity Ring Down Spectroscopy |
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Authors: | A Campargue L Wang AW Liu SM Hu S Kassi |
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Institution: | 1. Laboratoire de Spectrométrie Physique (Associated with CNRS, UMR 5588), Université Joseph Fourier de Grenoble, B.P. 87, 38402 Saint-Martin-d’Hères Cedex, France;2. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China |
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Abstract: | The positions and intensities of methane in the 1.58 μm transparency window have been measured by high sensitivity Cavity Ring Down Spectroscopy at room temperature. The achieved sensitivity allowed measuring intensities as small as 3 × 10−29 cm/molecule i.e. three orders of magnitude smaller than the intensity cut off of the HITRAN line list of methane. The complete list contains a total of 16,149 transitions between 6165 and 6750 cm−1. Their intensity values vary over six orders of magnitude from 1.6 × 10−29 to 2.5 × 10−23 cm/molecule. Transitions due to CH3D in “natural” abundance in our methane sample were identified using a new spectrum of CH3D recorded separately with a Fourier Transform spectrometer. From simulations of the CH3D and methane spectra at low resolution, the CH3D isotopologue has be found to contribute by up to 30% of the absorption near 1.58 μm. |
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Keywords: | Methane CH4 CH3D Titan CRDS HITRAN |
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