Microwave Detection of Interstellar Vinyl Alcohol, CH2=CHOH
Microwave Detection of Interstellar Vinyl Alcohol, CH2=CHOH
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微波检测星际乙烯醇，CH2=CHOH
DOI：
10.1086/324762
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
A. Apponi
中科院分区：
文献类型：
--
作者：
B. Turner;A. Apponi
通过其毫米波旋转跃迁，在朝向人马座 B2N 的发射中检测到了乙烯醇 (CH2=CHOH)。乙烯醇是最简单的烯醇，是许多有机化学反应中的重要中间体。 C2H4O 家族的所有三种稳定异构体：乙烯醇、环氧乙烷 (c-C2H4O) 和乙醛 (CH3–CHO) 现已在星际介质中得到鉴定，C2H4O2 异构体的三个成员（Hollis、Lovas 和 Jewell）也是如此。这些复杂的物质无法通过静态气相化学模型以检测到的量产生，并且长期以来人们一直在设想颗粒过程。我们对这六种物质丰度的分析表明，大量不太复杂的物质（如CH3OH和H2CO）从颗粒中蒸发，随后蒸发物质之间发生气相反应，解释了其中四种物质的高丰度，而不太稳定的乙二醇醛和乙烯醇物质的异构化（在颗粒上）则解释了它们的丰度较低。催化对谷物的作用仍不清楚。
Vinyl alcohol (CH2=CHOH) has been detected in emission toward Sagittarius B2N by means of its millimeter-wave rotational transitions. The simplest enol, vinyl alcohol is an important intermediate in many organic chemistry reactions. All three stable isomers of the C2H4O family, vinyl alcohol, ethylene oxide (c-C2H4O), and acetaldehyde (CH3–CHO) have now been identified in the interstellar medium, as have the three members of the C2H4O2 isomeric group (Hollis, Lovas, and Jewell). These complex species cannot be produced in detected amounts by quiescent gas-phase chemistry models, and grain processes have long been envisioned. Our analysis of the abundances of the six species suggests that evaporation from grains of copious amounts of less complex species such as CH3OH and H2CO, followed by gas-phase reactions among the evaporated species, explain the high abundance of four of the species, while isomerization (on grains) of the less stable glycol aldehyde and vinyl alcohol species accounts for their lower abundances. The role of catalysis on grains remains unclear.