氘代甲基氘（CH $_3$ SD）：实验室旋转光谱和对IRAS 16293-2422 B的搜索
Deuterated methyl mercaptan (CH$_3$SD): Laboratory rotational spectroscopy and search toward IRAS 16293-2422 B
摘要：
甲基硫（也称为甲烷硫），CH 3SH，在高质量和低质量恒星形成区域的温暖和密集部分被发现。本研究的目的是获得准确的光谱参数的S-氘代甲基CH_2CH $_3$ SD，以方便天文观测的射电望远镜阵列在（亚）毫米波长。我们用Köln毫米波光谱仪在150-510 GHz频率范围内用同位素富集样品测量了与甲基萘的甲基基团的大幅度内旋转相关的旋转光谱。谱的分析已经进行到第二激发扭转状态。我们提出了这些数据与RAM 36程序的建模结果。CH $_3$ SD在阿塔卡马大型毫米/亚毫米阵列（ALMA）原恒星干涉测线巡天（PILS）的数据中被搜索，但没有被发现。导出的上限对应于至多~ 18%的氘化度。
英文摘要：
Methyl mercaptan (also known as methanethiol), CH3SH, has been found in the warm and dense parts of high -- as well as low -- mass star-forming regions. The aim of the present study is to obtain accurate spectroscopic parameters of the S-deuterated methyl mercaptan CH$_3$SD to facilitate astronomical observations by radio telescope arrays at (sub)millimeter wavelengths. We have measured the rotational spectrum associated with the large-amplitude internal rotation of the methyl group of methyl mercaptan using an isotopically enriched sample in the 150-510 GHz frequency range using the Köln millimeter wave spectrometer. The analysis of the spectra has been performed up to the second excited torsional state. We present modeling results of these data with the RAM36 program. CH$_3$SD was searched for, but not detected, in data from the Atacama Large Millimeter/submillimeter Array (ALMA) Protostellar Interferometric Line Survey (PILS) of the deeply embedded protostar IRAS 16293-2422. The derived upper limit corresponds to a degree of deuteration of at most ~18%.
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