碳氢化合物等离子体absorption spectrum和λ 5450 DIB之间的重合
A coincidence between a hydrocarbon plasma absorption spectrum and the lambda 5450 DIB
摘要：
这项工作的目的是连接到一个实验室的光谱通过扩大乙炔等离子体的宽λ 5450弥漫星际带（DIB）。本文比较了用拉帕尔马墨卡托望远镜上的HERMES摄谱仪和DAO 1.2 m望远镜上的McKellar摄谱仪对HD 183143的光腔衰荡直接吸收光谱和天文观测。在543-547 nm区域中，测量到宽带，其带最大值在545 nm处，FWHM为1.03（0.1）nm，与公知的在λ 5450处的扩散星际带一致，FWHM为0.953 nm。在实验室和两个独立的观测研究之间发现了一个巧合，在更高的光谱分辨率。这一结果很重要，因为实验室光谱和潜在寿命加宽的DIB之间存在匹配。为了明确识别该波段的实验室载体，进行了一系列额外的实验。这是不可能的。然而，实验室结果将载体限制为由碳和氢组成的分子瞬变。
英文摘要：
The aim of this work is to link the broad lambda 5450 diffuse interstellar band (DIB) to a laboratory spectrum recorded through an expanding acetylene plasma. Cavity ring-down direct absorption spectra and astronomical observations of HD 183143 with the HERMES spectrograph on the Mercator Telescope in La Palma and the McKellar spectrograph on the DAO 1.2 m Telescope are compared. In the 543-547 nm region a broad band is measured with a band maximum at 545 nm and FWHM of 1.03(0.1) nm coinciding with a well-known diffuse interstellar band at lambda 5450 with FWHM of 0.953 nm. A coincidence is found between the laboratory and the two independent observational studies obtained at higher spectral resolution. This result is important, as a match between a laboratory spectrum and a - potentially lifetime broadened - DIB is found. A series of additional experiments has been performed in order to unambiguously identify the laboratory carrier of this band. This has not been possible. The laboratory results, however, restrict the carrier to a molecular transient, consisting of carbon and hydrogen.
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