论文标题
硫氧基自由基振动过渡的实验室光谱
Laboratory Optical Spectroscopy of Vibronic Transitions of the Thiophenoxy Radical
论文作者
论文摘要
硫代氧基自由基（C6H5S）是由于5000 A区域的电子过渡而可能具有天体物理兴趣的一种。使用腔环钟谱仪测量了该自由基在排出硫酚中的B <-x电子跃迁。该过渡的光吸收光谱是在覆盖范围（0-0）到1750 cm-1的频率的范围内获得的。 400-1700 cm-1区域中的振动带比原始带强，表明地面和激发电子状态之间的结构差异。从6B10禁止频段开始，将突出的进程分配给6A对称内的CCC内CCC弯曲模式。通过分析旋转曲线来确定单个条带的谱带起源。尽管在弥漫云的光谱中未发现这些振动带，但将thiophenoxy自由基的柱密度的上限延伸至HD 183143和HD 204827评估为4 x 10^13 cm-2。
The thiophenoxy radical (C6H5S) is a species of possible astrophysical interest due to an electronic transition in a 5000 A region. The B <-- X electronic transition of this radical in the discharge of thiophenol was measured using a cavity ring-down spectrometer. The optical absorption spectrum of this transition was obtained in the range covering from the origin band (0-0) to a frequency of 1750 cm-1. The vibronic bands in the 400-1700 cm-1 region are stronger than the origin band, suggesting structural difference between the ground and excited electronic states. The prominent progression was assigned to the 6a symmetric in-plane CCC bending mode starting from the 6b10 forbidden band. Band origins of individual bands were determined by analysis of the rotational profiles. Although these vibronic bands were not found in optical spectra of diffuse clouds, the upper limits of the column densities for the thiophenoxy radical in the diffuse clouds toward HD 183143 and HD 204827 were evaluated to be 4 x 10^13 cm-2.
