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arXiv 1302.2485astro-ph.EPphysics.ao-phphysics.chem-ph
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SO3的从头变分计算室温谱线表

An ab initio variationally computed room-temperature line list for SO3

Daniel S. Underwood, Jonathan Tennyson, Sergei N. Yurchenko

摘要:

在CCSD(T)-F12 b水平和适当的三重zeta基组下计算了三氧化硫(SO $_3$)的{\it Ab initio}势能面和偶极矩面.对平衡S-O距离作了轻微的修正后,用变分核运动程序TROVE拟合并计算了\sothree的纯转动谱和转动-振动谱.计算考虑了0 - 4000 \cm\区域中的跃迁,转动状态高达J = 85。得到的349~348~513跃迁谱线表适用于模拟室温SO_3光谱。与所观察到的红外吸收光谱和计算被用来放置在一个绝对尺度上的测量的相对强度的良好协议。提供了一个包含10~878个实验跃迁的列表,其形式适合于纳入标准大气和行星光谱数据库。

英文摘要:

{\it Ab initio} potential energy and dipole moment surfaces are computed for sulfur trioxide (SO$_3$) at the CCSD(T)-F12b level of theory and appropriate triple-zeta basis sets. These surfaces are fitted and used, with a slight correction for the equilibrium S--O distance, to compute pure rotational and rotation-vibraton spectra of \sothree\ using the variational nuclear motion program TROVE. The calculations considered transitions in the region 0--4000 \cm\ with rotational states up to J=85. The resulting line list of 349~348~513 transitions is appropriate for modelling room temperature SO3 spectra. Good agreement is found with the observed infrared absorption spectra and the calculations are used to place the measured relative intensities on an absolute scale. A list of 10~878 experimental transitions is provided in a form suitable for inclusion in standard atmospheric and planetary spectroscopic databases.

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