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标题：Laboratory formation of large molecules in the gas phase
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作者：Junfeng Zhen
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：623
DOI：10.1051/0004-6361/201834847
语种：English
出版社：EDP Sciences
摘要：We report the experimental study on the formation process of large molecules (e.g. a family group of molecular clusters and graphene) in the gas phase. The experiment was carried out using a quadrupole ion trap in combination with time-of-flight mass spectrometry. As the initial molecular precursor, dicoronylene (DC, C48H20)/anthracene (C14H10) cluster cations, the results show that large PAH cluster cations (e.g., (C14H10)C48Hn+,n= [1–19] and (C14H10)C62Hm+,m= [1–25]) and PAH-graphene cluster cations (e.g., (C14H10)nC48+,n= 0, 1, 2, 3 and (C14H10)mC62+,m= 0, 1, 2) are formed by gas-phase condensation under laser irradiation conditions. We infer that these results present in here provide a formation route for interstellar large molecules under the influence of a strong radiation field in the ISM. The relevance of newly formed species to the nanometer-sized dust grain in space is briefly discussed.
关键词：Key wordsenastrochemistrymolecular processesmethods: laboratory: molecularultraviolet: ISMevolution