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THE GAS PHASE SPECTRUM OF CYCLIC C_(18) AND THE DIFFUSE INTERSTELLAR BANDS

机译:循环C_(18)和弥散星际带的气相谱

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摘要

The gas phase spectrum of the cyclic C_(18) molecule recorded in the laboratory at a temperature typical of diffuse interstellar clouds is compared with absorption features toward ζ Oph and HD 204827 in the 5730—5934 A region. For the origin band at 5928.5 A an upper limit to the column density of ≤ 1.8 x 10~(11) cm~(-2) is inferred. The origin band pattern in the laboratory spectrum changes on lowering the internal temperature in the 100-20 K range and bears a striking resemblance to the observed structure of a number of DIBs at other wavelengths. This suggests that platelike molecules or ions, comprising a couple of dozen to hundred carbon atoms, could be responsible for some of the latter absorptions.
机译:将实验室中记录的在弥漫星际云典型温度下的环状C_(18)分子的气相光谱与5730-5934 A区域中对ζOph和HD 204827的吸收特征进行了比较。对于5928.5 A处的原始带,推断出列密度的上限为≤1.8 x 10〜(11)cm〜(-2)。实验室光谱中的原始谱带模式会在100-20 K范围内降低内部温度时发生变化,并且与在其他波长下观察到的许多DIB的结构具有惊人的相似之处。这表明,包含数十至一百个碳原子的板状分子或离子可能是后者吸收某些碳的原因。

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