The detection of acetaldehyde in cold dust clouds.
The detection of acetaldehyde in cold dust clouds.
复制标题
冷尘云中乙醛的检测。
DOI：
10.1086/163018
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
W. Irvine
中科院分区：
文献类型：
--
作者：
H. Matthews;P. Friberg;W. Irvine
本文报道了乙醛A和E态1（01）→> 0（00）转动跃迁的观测结果。在星际空间中，在冷尘埃云TMC-1和L134 N以及Sgr B2中首次检测到这种转变。这也是第一次在尘埃云中发现乙醛，并且是在这种环境中已知的最复杂的含氧分子。我们发现TMC-1的柱密度为6 x 10（12）cm-2，与在那里检测到的许多其他物种相当，L134 N的柱密度大致相等。在Sgr B2的方向，CH 3CHO配置文件似乎包括广泛的发射功能，从热分子云的核心，以及吸收功能，从介入较冷的材料。我们还报告了通过其J = 33 -> 32跃迁可能检测到IRC +10度216的HC 9 N。冷尘埃云化学和激发的影响进行了讨论。
Observations of the 1(01) --> 0(00) rotational transitions of A and E state acetaldehyde are reported. The transitions were detected, for the first time in interstellar space, in the cold dust clouds TMC-1 and L134N, and in Sgr B2. This is also the first time acetaldehyde has been found in a dust cloud and is the most complex oxygen-bearing molecule yet known in this environment. We find a column density of 6 x 10(12) cm-2 in TMC-1, comparable to many other species detected there, and an approximately equal column density in L134N. In the direction of Sgr B2, the CH3CHO profile appears to consist of broad emission features from the hot molecular cloud core, together with absorption features resulting from intervening colder material. We also report the possible detection of HC9N toward IRC +10 degrees 216 through its J = 33 --> 32 transition. Implications for cold dust cloud chemistry and excitation are discussed.