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arXiv 1401.4852astro-ph.EPastro-ph.SR
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ExoMol行列表IV:甲烷在1500 K以下的旋转振动光谱

ExoMol line lists IV: The rotation-vibration spectrum of methane up to 1500 K

Sergei N. Yurchenko, Jonathan Tennyson

摘要:

计算了$^{12}$ CH $_4$在基态电子态下的一个新的热线表。这个线列表,称为10到10,包含98亿个转变,并且应该在高达1500 K的温度下完成。它涵盖了长于1 $μ$ m的波长,并包括能量低于$hc \cdot 18\,000$ cm $^{-1}$和旋转激发高达$J=39$的所有跃迁。用TROVE程序,通过对原子核旋振运动的薛定谔方程的变分求解,得到CH $_4$的本征值和本征函数,计算了谱线表。一个从头计算偶极矩表面和一个新的“光谱”势能面。与其他可用的甲烷转换源,包括HITRAN,实验汇编和其他理论谱线列表的详细比较表明,这些源缺乏更高的温度和近红外波长的转换。该行列表适用于对冷恒星和系外行星的大气进行建模。可从CDS数据库以及www.exomol.com获得。

英文摘要:

A new hot line list is calculated for $^{12}$CH$_4$ in its ground electronic state. This line list, called 10to10, contains 9.8 billion transitions and should be complete for temperatures up to 1500 K. It covers the wavelengths longer than 1 $μ$m and includes all transitions to upper states with energies below $hc \cdot 18\,000$ cm$^{-1}$ and rotational excitation up to $J=39$. The line list is computed using the eigenvalues and eigenfunctions of CH$_4$ obtained by variational solution of the Schrödinger equation for the rotation-vibration motion of nuclei employing program TROVE. An ab initio dipole moment surface and a new 'spectroscopic' potential energy surface are used. Detailed comparisons with other available sources of methane transitions including HITRAN, experimental compilations and other theoretical line lists show that these sources lack transitions both higher temperatures and near infrared wavelengths. This line list is suitable for modelling atmospheres of cool stars and exoplanets. It is available from the CDS database as well as at www.exomol.com.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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