First detection of triply-deuterated methanol
First detection of triply-deuterated methanol
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首次检测到三重氘代甲醇
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. Tielens
中科院分区：
文献类型：
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作者：
B. Parise;A. Castets;E. Herbst;E. Caux;C. Ceccarelli;I. Mukhopadhyay;A. Tielens
我们报告了首次检测到三氘化甲醇，有12个观测到的向低质量原恒星IRAS 16293−2422的转变，以及13 CH3OH的多频观测，用于推导主同位素体CH3OH的柱密度。推导出的CD3OH / CH3OH在10°梁上的平均分馏比为1.4%。结合之前的CH2DOH和CHD2OH观测结果，如果吸积气体中原子D/H比为0.1 ~ 0.3，则CD3OH观测结果与颗粒表面甲醇的形成一致。如此高的原子比可以在气相化学模型的框架内达到，包括H +的所有氘化同位素体。
We report the first detection of triply-deuterated methanol, with 12 observed transitions, towards the low-mass protostar IRAS 16293−2422, as well as multifrequency observations of 13 CH3OH, used to derive the column density of the main isotopomer CH3OH. The derived fractionation ratio (CD3OH)/(CH3OH) averaged on a 10 �� beam is 1.4%. Together with previous CH2DOH and CHD2OH observations, the present CD3OH observations are consistent with a formation of methanol on grain surfaces, if the atomic D/H ratio is 0.1 to 0.3 in the accreting gas. Such a high atomic ratio can be reached in the framework of gas-phase chemical models including all deuterated isotopomers of H + .