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标题：Tentative detection of HC 5NH + in TMC-1 ⋆
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作者：N. Marcelino ; M. Agúndez ; B. Tercero 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2020
卷号：643
页码：1-9
DOI：10.1051/0004-6361/202039251
语种：English
出版社：EDP Sciences
摘要：Using the Yebes 40m radio telescope, we report the detection of a series of seven lines harmonically related with a rotational constantB0= 1295.81581 ± 0.00026MHz and a distortion constantD0= 27.3 ± 0.5Hz towards the cold dense cloud TMC-1. Ab initio calculations indicate that the best possible candidates are the cations HC5NH+and NC4NH+. From a comparison between calculated and observed rotational constants and other arguments based on proton affinities and dipole moments, we conclude that the best candidate for a carrier of the observed lines is the protonated cyanodiacetylene cation, HC5NH+. The HC5N/HC5NH+ratio derived in TMC-1 is 240, which is very similar to the HC3N/HC3NH+ratio. Results are discussed in the framework of a chemical model for protonated molecules in cold dense clouds.
关键词：enastrochemistryISM: moleculesISM: individual objects: TMC-1line: identificationmolecular data