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Abstract

The absorption spectral parameters of water vapor molecules are the key basic scientific data for the remote sensing detection and the planetary observation applications. Based on a narrow line-width external cavity diode laser and a long-path absorption cell, 18 absorption spectral lines of CO ₂-broadened water vapor molecules in a 9332–9722 cm ^–1range at room temperature are measured. To obtain the CO ₂-broadened water vapor molecule coefficients, the Voigt profile and the quadratic speed-dependent Voigt profile are used to fit the absorption spectrum data. The quadratic speed-dependent Voigt profile shows better fitting capability. Comparing with the air-broadened coefficients of the corresponding region from the HITRAN2020 database, the mean ratios of the CO ₂-broadened coefficients of water vapor molecules and the air-broadened coefficients obtained from the two models of the line shape are 1.327 and 1.454, respectively, which verifies that the method of estimating the CO ₂-broadened coefficient by the air-broadened coefficient of water vapor molecules has certain reliability. This study can provide reference data of measured spectral parameters for the detection technology and related research of atmospheric structures of Mars and Venus in the near-infrared region.

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Authors and contacts

Corresponding author:Liu Qiang,liuq@aiofm.ac.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 41805014), the Foundation of Key Laboratory of Science and Technology Innovation of Chinese Academy of Sciences (Grant No. CXJJ-21S028), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDA17010104), the National Defense Basic Scientific Research Program of Bureau of Science, Technology and Industry of China (Grant No. JCKY2019130D021), the Key Program of the Youth Talent Support Plan in Universities of Anhui Province, China (Grant No. gxyqZD2020032), and the Open Fund of Key Laboratory of Atmospheric Optics, Chinese Academy of Sciences (Grant No. JJ-19-01).

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线位置 $ {\nu }_{0}/{\rm cm}^{-1}$	CO₂加宽系数$/({\mathrm{c}\mathrm{m} }^{-1}{\cdot}{\mathrm{a}\mathrm{t}\mathrm{m} }^{-1})$			空气加宽系数/ $({\mathrm{c}\mathrm{m} }^{-1}{\cdot}{\mathrm{a}\mathrm{t}\mathrm{m} }^{-1})$	比值
	VP	qSDVP		$ {\gamma }_{\mathrm{H}\mathrm{I}\mathrm{T}\mathrm{R}\mathrm{A}\mathrm{N}}^{\mathrm{A}\mathrm{I}\mathrm{R}} $	$\dfrac{{\gamma }_{1}^{ {\mathrm{C}\mathrm{O} }_{2} }}{\gamma _{\mathrm{H}\mathrm{I}\mathrm{T}\mathrm{R}\mathrm{A}\mathrm{N} }^{\mathrm{A}\mathrm{I}\mathrm{R} }}\Big/{\text{%} }$	$\dfrac{{\gamma }_{0}^{ {\mathrm{C}\mathrm{O} }_{2} }}{\gamma _{\mathrm{H}\mathrm{I}\mathrm{T}\mathrm{R}\mathrm{A}\mathrm{N} }^{\mathrm{A}\mathrm{I}\mathrm{R} }}\Big/{\text{%} }$	$\dfrac{{\gamma }_{0}^{ {\mathrm{C}\mathrm{O} }_{2} }}{{\gamma }_{\mathrm{V}\mathrm{P} }^{ {\mathrm{C}\mathrm{O} }_{2} }}\Big/{\text{%} }$
	$ {\gamma }_{1}^{{\mathrm{C}\mathrm{O}}_{2}} $	$ {\gamma }_{0}^{{\mathrm{C}\mathrm{O}}_{2}} $	$ {\gamma }_{2}^{{\mathrm{C}\mathrm{O}}_{2}} $
9332.623	0.079(0.42)	0.093(1.86)	0.020(6.8)	0.0483	1.632	1.917	1.175
9335.691	0.107(0.58)	0.111(2.76)	0.013(18.7)	0.0772	1.391	1.441	1.036
9339.709	0.083(0.74)	0.100(4.95)	0.007(20.0)	0.0732	1.135	1.361	1.199
9344.263	0.084(0.69)	0.097(2.51)	0.016(7.07)	0.0573	1.468	1.685	1.148
9346.912	0.095(0.66)	0.102(1.61)	0.026(6.92)	0.0762	1.247	1.341	1.076
9351.149	0.072(0.18)	0.079(1.37)	0.005(9.63)	0.0623	1.153	1.274	1.105
9351.509	0.082(1.14)	0.092(4.00)	0.004(12.05)	0.0804	1.014	1.150	1.134
9366.591	0.084(0.18)	0.085(1.27)	0.018(17.27)	0.0602	1.394	1.418	1.017
9366.781	0.082(0.40)	0.089(2.40)	0.089(2.40)	0.0565	1.451	1.568	1.081
9388.751	0.085(0.96)	0.094(2.58)	0.015(9.77)	0.0637	1.328	1.472	1.108
9388.968	0.096(0.56)	0.102(3.35)	0.069(18.15)	0.0791	1.212	1.294	1.067
9409.130	0.086(0.41)	0.089(1.92)	0.010(12.02)	0.0713	1.205	1.245	1.034
9412.790	0.122(1.30)	0.133(3.37)	0.019(6.05)	0.0817	1.489	1.625	1.092
9676.881	0.068(0.32)	0.073(1.60)	0.016(11.04)	0.0473	1.446	1.552	1.073
9694.811	0.083(0.28)	0.098(2.41)	0.031(9.83)	0.0628	1.323	1.560	1.180
9713.959	0.094(0.69)	0.099(2.72)	0.024(11.35)	0.0726	1.294	1.370	1.059
9720.277	0.114(0.51)	0.118(3.86)	0.027(7.39)	0.0831	1.367	1.421	1.040
9721.806	0.094(0.20)	0.104(1.15)	0.024(8.58)	0.0704	1.338	1.477	1.104

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Vol. 71, Issue 20 - 2022-10-20

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