Temperature dependences of air-broadening, air-narrowing and line-mixing coefficients of the methane nu 3 R(6) manifold lines-Application to in-situ measurements of atmospheric methane
In this work, we have revisited the spectroscopy of the R(6) manifold of the nu 3 band of methane which is particularly suitable for in situ laser monitoring of CH4. For that purpose, a home-made Difference Frequency Generation (DFG) laser emitting at 3.24 mu m has been coupled to a cryogenically-co...
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Veröffentlicht in: | Journal of quantitative spectroscopy & radiative transfer 2014-01, Vol.133, p.206-216 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In this work, we have revisited the spectroscopy of the R(6) manifold of the nu 3 band of methane which is particularly suitable for in situ laser monitoring of CH4. For that purpose, a home-made Difference Frequency Generation (DFG) laser emitting at 3.24 mu m has been coupled to a cryogenically-cooled optical cell to investigate the temperature dependences of the air-broadening, the air-narrowing and the air-mixing coefficients of these nu 3 R(6) manifold transitions. The temperatures of the measurements range from 213.5 K to room temperature. These are typically the temperatures found in the troposphere and the lower stratosphere. Finally, the measured spectroscopic parameters have been used to process the in-situ methane absorption spectra recorded by a balloon-borne laser diode spectrometer. |
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ISSN: | 0022-4073 |
DOI: | 10.1016/j.jqsrt.2013.08.003 |