Journal
ASTROPHYSICAL JOURNAL
Volume 866, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aae38f
Keywords
astrochemistry; ISM: molecules; infrared: ISM; line: formation; methods: laboratory: molecular
Categories
Funding
- Swedish Research Council [2015-06501]
- Swedish National Infrastructure for Computing [SNIC 2018/5-8]
- Vinnova [2015-06501] Funding Source: Vinnova
- Swedish Research Council [2015-06501] Funding Source: Swedish Research Council
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Photo-/ion-induced ionization and dissociation processes are commonly observed for polycyclic aromatic hydrocarbon (PAH) molecules. This work performs theoretical studies of PAHs and their fragments. Molecular dynamics simulations in combination with static quantum chemical calculations reveal that following a single hydrogen atom loss, the fragments, PAH-H, are extremely reactive. They catch a neighbor molecule within picoseconds to form a covalently bonded large molecule regardless of orientations/angles and temperatures. We calculate the infrared spectra of the covalently bonded molecules, which indicate that such species could be the carrier of unidentified infrared emission bands. It also implies that regular PAHs might be less abundant in space than what is expected.
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