基于辐射和碰撞转动分布的噻吩氧自由基星际扩散带光谱及其轮廓模拟
Laboratory Optical Spectroscopy of Thiophenoxy Radical and Its Profile Simulation as a Diffuse Interstellar Band Based on Rotational Distribution by Radiation and Collisions
摘要：
利用光腔衰荡光谱仪在苯硫酚放电过程中观测到了扩散星际带候选分子噻吩氧自由基（C6H5S）的气相光吸收光谱。从理论上计算了噻吩氧基自由基的基态转动常数，并从观测到的转动曲线确定了激发态转动常数。基于转动分布模型，通过辐射和碰撞模拟了具有C2v对称性的近扁长分子的转动分布。尽管模拟的分布与观测到的DIB不一致，但对HD 204827扩散云中噻吩氧基自由基的柱密度上限进行了评价。轮廓模拟表明，旋转分布的辐射和碰撞是很重要的再现旋转轮廓的DIB候选人，近长C2v分子是一个可能的候选人DIB的带宽变化依赖于视线。
英文摘要：
The gas-phase optical absorption spectrum of a thiophenoxy radical (C6H5S), a diffuse interstellar band (DIB) candidate molecule, was observed in the discharge of thiophenol using a cavity ringdown spectrometer. The ground-state rotational constants of the thiophenoxy radical were theoretically calculated, and the excited-state rotational constants were determined from the observed rotational profile. The rotational profile of a near prolate molecule having a C2v symmetry was simulated on the basis of a rotational distribution model by radiation and collisions. Although the simulated profile did not agree with the observed DIBs, the upper limit of the column density for the thiophenoxy radical in the diffuse clouds toward HD 204827 was evaluated. The profile simulation indicates that rotational distribution by radiation and collisions is important to reproduce a rotational profile for a DIB candidate and that the near prolate C2v molecule is a possible candidate for DIB with a band width variation dependent on line-of-sight.
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