Rotational spectroscopy of oxirane-2,2-d2, c-CD2CH2O, and its tentative detection toward IRAS 16293-2422 B

IF 1.4 4区物理与天体物理 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Journal of Molecular Spectroscopy Pub Date : 2023-04-01 DOI:10.1016/j.jms.2023.111777

Holger S.P. Müller , Jes K. Jørgensen , Jean-Claude Guillemin , Frank Lewen , Stephan Schlemmer

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引用次数: 1

Abstract

We prepared a sample of oxirane doubly deuterated at one C atom and studied its rotational spectrum in the laboratory for the first time between 120 GHz and 1094 GHz. Accurate spectroscopic parameters up to eighth order were determined, and the calculated rest frequencies were used to identify $c$ -CD $_{2}$ CH $_{2}$ O tentatively in the interstellar medium in the Atacama Large Millimeter/submillimeter Array Protostellar Interferometric Line Survey (PILS) of the Class 0 protostellar system IRAS 16293-2422. The $c$ -CD $_{2}$ CH $_{2}$ O to $c$ -C $_{2}$ H $_{4}$ O ratio was estimated to be $\sim$ 0.054 with $T_{rot} = 125$ K. This value translates to a D-to-H ratio of $\sim$ 0.16 per H atom which is higher by a factor of 4.5 than the $\sim$ 0.036 per H atom obtained for $c$ -C $_{2}$ H $_{3}$ DO. Such increase in the degree of deuteration referenced to one H atom in multiply deuterated isotopologs compared to their singly deuterated variants have been observed commonly in recent years.

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环氧乙烷-2,2-d2，c-CD2CH2O的旋转光谱及其对IRAS 16293-2422B的初步检测

我们制备了一个C原子上双氘代的环氧乙烷样品，并首次在实验室中研究了其在120GHz至1094GHz之间的旋转光谱。在0级原恒星系统IRAS 16293-2422的阿塔卡马大毫米/亚毫米阵列原恒星干涉测线（PILS）中，确定了高达八阶的精确光谱参数，并使用计算的静息频率初步识别了星际介质中的c-CD2CH2O。当Trot=125 K时，c-CD2CH2O与c-C2H4O的比率估计为～0.054。该值转化为每H原子～0.16的D-to-H比率，比c-C2H3DO获得的每H原子约0.036高4.5倍。近年来，人们普遍观察到，与单个氘化变体相比，多重氘化等位异构体中一个H原子的氘化程度增加。

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来源期刊

Journal of Molecular Spectroscopy 物理-光谱学

CiteScore

2.70

自引率

21.40%

发文量

审稿时长

29 days

期刊介绍： The Journal of Molecular Spectroscopy presents experimental and theoretical articles on all subjects relevant to molecular spectroscopy and its modern applications. An international medium for the publication of some of the most significant research in the field, the Journal of Molecular Spectroscopy is an invaluable resource for astrophysicists, chemists, physicists, engineers, and others involved in molecular spectroscopy research and practice.

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