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首页> 外文期刊>Astronomy and astrophysics >Rotational spectra of isotopic species of methyl cyanide, CH$_3$CN, in their ground vibrational states up to terahertz frequencies
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Rotational spectra of isotopic species of methyl cyanide, CH$_3$CN, in their ground vibrational states up to terahertz frequencies

机译：处于高达太赫兹频率的基态振动状态下的甲基氰CH $ _3 $ CN同位素物种的旋转光谱

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Context. Methyl cyanide is an important trace molecule instar-forming regions. It is one of the more common molecules used toderive kinetic temperatures in such sources. Aims. As preparatory work for Herschel, SOFIA, and in particularALMA we want to improve the rest frequencies of the main as well asminor isotopologs of methyl cyanide. Methods. The laboratory rotational spectrum of methyl cyanide in natural isotopic composition has been recorded up to 1.63THz. Results. Transitions with good signal-to-noise ratio could be identified for CH3CN, 13CH3CN, CH313CN, CH3C15N, CH2DCN, and 13CH313CNin their ground vibrational states up to about 1.2THz. The mainisotopic species could be identified even in the highest frequencyspectral recordings around 1.6THz. The highest J' quantum numbers included in the fit are 64 for 13CH313CNand 89 for the main isotopic species. Greatly improved spectroscopicparameters have been obtained by fitting the present data together withpreviously reported transition frequencies. Conclusions. The present data will be helpful to identifyisotopologs of methyl cyanide in the higher frequency bands ofinstruments such as the recently launched Herschel satellite, theupcoming airplane mission SOFIA or the radio telescope array ALMA. Key words: molecular data - methods: laboratory - techniques: spectroscopic - radio lines: ISM - ISM: molecules
机译：上下文。氰化甲烷是重要的痕迹分子成星区域。它是在此类来源中推导动力学温度的较常见分子之一。目的作为Herschel，SOFIA以及特别是ALMA的准备工作，我们希望提高主要和次要甲基异氰酸酯的静止频率。方法。天然同位素组成中甲基氰化物的实验室旋转光谱已记录到高达1.63THz。结果。可以确定CH3CN，13CH3CN，CH313CN，CH3C15N，CH2DCN和13CH313CN在其大约1.2THz的基态振动状态下具有良好的信噪比的跃迁。即使在1.6THz左右的最高频率频谱记录中也可以识别出主要同位素物种。拟合中包括的最高J'量子数对于13CH313CN为64，对于主要同位素而言为89。通过将当前数据与先前报道的跃迁频率进行拟合，可以大大提高光谱参数。结论。目前的数据将有助于识别仪器的较高频段中的甲基氰的同位素，如最近发射的赫歇尔卫星，即将进行的飞机任务SOFIA或射电望远镜阵列ALMA。关键词：分子数据-方法：实验室-技术：光谱学-无线电线：ISM-ISM：分子

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