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Laboratory Photochemistry of Pyrene Clusters: An Efficient Way to Form Large PAHs
Univ Sci & Technol China, Dept Astron, CAS Key Lab Res Galaxies & Cosmol, Hefei 230026, Anhui, Peoples R China.;Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.
Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands..
2018 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 863, no 2, article id 128Article in journal (Refereed) Published
Abstract [en]

In this work, we study the photodissociation processes of small PAH clusters (e.g., pyrene clusters). The experiments are carried out using a quadrupole ion trap in combination with time-of-flight (QIT-TOF) mass spectrometry. The results show that pyrene clusters are converted into larger PAHs under the influence of a strong radiation field. Specifically, pyrene dimer cations (e.g., [C16H10-C16H9](+) or C32H19 (+)), will photodehydrogenate and photo-isomerize to fully aromatic cations (PAHs) (e.g., C32H16 (+)) with laser irradiation. The structure of new formed PAHs and the dissociation energy for these reaction pathways are investigated with quantum chemical calculations. These studies provide a novel efficient evolution routes for the formation of large PAHs in the interstellar medium in a bottom-up process that will counteract the top-down conversion of large PAHs into rings and chains, and provide a reservoir of large PAHs that can be converted into C-60 and other fullerenes and large carbon cages.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2018. Vol. 863, no 2, article id 128
Keywords [en]
astrochemistry, ISM: molecules, methods: laboratory: molecular, molecular processes ultraviolet: ISM
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-234609DOI: 10.3847/1538-4357/aad240ISI: 000442070500005Scopus ID: 2-s2.0-85052402058OAI: oai:DiVA.org:kth-234609DiVA, id: diva2:1248187
Note

QC 20180914

Available from: 2018-09-14 Created: 2018-09-14 Last updated: 2018-09-14Bibliographically approved

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