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New experimental measurements of the H2-CO2 Collision-Induced Absorption in the [3907, 4770] cm^-1 spectral range from 241 to 498 K

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Zenodo2026-03-17 更新2026-05-26 收录
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Binary absorption coefficients (BACs) of the H$_2$-CO$_2$ Collision-Induced Absorption (CIA) are given in tabular form for six temperatures from 241 to 498 K in the [3907, 4780] cm$^{-1}$ spectral range. Tables are composed of three columns. The first column represents the wavenumber in cm$^{-1}$, in the second column the binary absorption coefficients in cm$^5$ molecule$^{-2}$ are collected, and the third column contains the accuracy of the binary coefficients in cm$^5$ molecule$^{-2}$. Every column is delimited with a comma. The accuracy can be supposed to be of three significant digits, even if the trailing zeros are not displayed. The a_coefficients_std.txt table contains the a$_n$ coefficients (with the subscript n running from 1 to 4) obtained from the interpolation of the experimental BACs performed using with the exponential profile presented in Tran (2024) (https://doi.org/10.1016/j.icarus.2024.116265) and following the same procedure. For each coefficients, the corresponding standard deviation obtained from the fits is provided. Those coefficients are only wavenumber-dependent, and can be used in the exponential profile, shown below, to calculate the BACs at each desired temperature within the range investigated experimentally. $k_{CIA}(\sigma, T) = k_{CIA}^{norm} \hspace{1.5mm} exp\bigg\{a_1(\sigma) + a_2(\sigma) \cdot \bigg(\frac{T}{T_0}\bigg) + a_3(\sigma) \cdot \bigg(\frac{T}{T_0}\bigg)^2 + a_4(\sigma) \cdot \bigg(\frac{T}{T_0}\bigg)^3 \bigg\}$ where a$_n$ are the coefficients obtained from the fit, T is the temperature, T$_0$ is the reference temperature equal to 296 K and $k_{CIA}^{norm}$ is a constant equal to 1 cm$^{-1}$ amagat$^{-2}$. The expression to calculate the relative errors on the fitted binary absorption coefficients starting from the standard deviations associated to the a_n coefficients is reported below: $\frac{\sigma_k}{k} = \sqrt{ \sigma_{a_1}^2 + (\frac{T}{T_0})^2 \hspace{1.5mm} \sigma_{a_2}^2 + (\frac{T}{T_0})^4 \hspace{1.5mm} \sigma_{a_3}^2 + (\frac{T}{T_0})^6 \hspace{1.5mm} \sigma_{a_4}^2} $

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Zenodo
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2026-01-23
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