Discovery of Interstellar Propylene (CH2CHCH3): Missing Links in Interstellar Gas-Phase Chemistry
Discovery of Interstellar Propylene (CH2CHCH3): Missing Links in Interstellar Gas-Phase Chemistry
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星际丙烯（CH2CHCH3）的发现：星际气相化学中缺失的环节
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Iram
中科院分区：
文献类型：
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作者：
N. Marcelino;J. Cernicharo;M. Agúndez;È. Roueff;M. Gerin;J. Martín;R. Mauersberger;C. T. DAMIR;Spain.;Luth;O. Paris;France;Lerma;É. Supérieure;Iram
We report the discovery of propylene (also called propene, CH2CHCH 3) with the IRAM 30 m radio telescope toward the dark cloud TMC-1. Propylene is the most saturated hydrocarbon ever detected in space through radio astronomical techniques. In spite of its weak dipole moment, six doublets (A and E species) plus another line from the A species have been observed with main-beam temperatures above 20 mK. The derived total column density of propylene is 4 × 1013 cm-2, which corresponds to an abundance relative to H2 of 4 × 10-9, i.e., comparable to that of other well-known and abundant hydrocarbons in this cloud, such as c-C3H2. Although this isomer of C3H6 could play an important role in interstellar chemistry, it has been ignored by previous chemical models of dark clouds as there seems to be no obvious formation pathway in gas phase. The discovery of this species in a dark cloud indicates that a thorough analysis of the completeness of gas-phase chemistry has to be done.
