实验室转动光谱学导致单氘代甲硫醇（CH$_{2}$DSH）的首次星际探测
Laboratory rotational spectroscopy leads to the first interstellar detection of singly deuterated methyl mercaptan (CH$_{2}$DSH)
AI总结：
本研究通过实验室转动光谱分析首次在星际空间探测到单氘代甲硫醇，揭示了硫与氧复杂有机物的星际化学差异，为理解硫基益生元的化学起源迈出关键一步。
摘要：
我们报告了使用毫米波和远红外同步辐射光谱对单氘代甲硫醇（CH$_{2}$DSH）进行的广泛转动光谱分析，以实现对该非刚性物种的三个最低扭转子态（e$_{0}$、e$_{1}$和o$_{1}$）的全局扭转分析。拟合包括3419个毫米波跃迁和43个红外扭转子带中心，均方根偏差分别为0.233 MHz和0.270 cm$^{-1}$，得到68个拟合参数。基于此分析构建的125 K温度下的光谱目录，导致在类太阳原恒星IRAS 16293-2422 B中首次星际探测到CH$_{2}$DSH。我们报告了46个跃迁的识别，包括8条相对未混合的谱线，得到的柱密度为（3.0±0.3）×10$^{14}$ cm$^{-2}$。HDCS/CH$_{2}$DSH与HDCO/CH$_{2}$DOH的柱密度比表明，硫和氧复杂有机物之间的星际化学存在差异，特别是H$_{2}$CO与CH$_{3}$OH之间以及H$_{2}$CS与CH$_{3}$SH之间的联系不同。这是首次星际探测到氘代含硫复杂有机分子，因此是理解硫基益生元化学起源的重要一步。
英文摘要：
We report an extensive rotational spectroscopic analysis of singly deuterated methyl mercaptan (CH$_{2}$DSH) using both millimeter and far-infrared synchrotron spectra to achieve a global torsional analysis of the three lowest torsional substates (e$_{0}$, e$_{1}$, and o$_{1}$) of this non-rigid species. A fit including 3419 millimeter wave transitions along with 43 infrared torsional subband centers was performed with root mean square deviations of 0.233 MHz and 0.270 cm$^{-1}$, respectively, resulting in 68 fit parameters. A spectroscopic catalogue built from this analysis for a temperature of 125 K has led to the first interstellar detection of CH$_{2}$DSH towards the Solar-like protostar IRAS 16293-2422 B. We report the identification of 46 transitions, including eight relatively unblended lines, resulting in a derived column density of (3.0$\pm$0.3)$\times$10$^{14}$ cm$^{-2}$. The column density ratio for HDCS/CH$_{2}$DSH compared to HDCO/CH$_{2}$DOH suggests a difference in the interstellar chemistry between the sulphur and oxygen complex organics, in particular a different link between H$_{2}$CO and CH$_{3}$OH and between H$_{2}$CS and CH$_{3}$SH. This is the first interstellar detection of a deuterated sulphur-bearing COM and therefore an important step into understanding the chemical origin of sulphur-based prebiotics.
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