Volume 623, March 2019
|Number of page(s)||5|
|Section||Interstellar and circumstellar matter|
|Published online||11 March 2019|
Laboratory formation of large molecules in the gas phase
CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China,
2 School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, PR China
Accepted: 25 January 2019
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.
Key words: astrochemistry / molecular processes / methods: laboratory: molecular / ultraviolet: ISM / evolution
© ESO 2019
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