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Superhydrogenated PAHs: Catalytic formation of H2

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DOI

The possible role of neutral PAHs as catalysts for H2 formation in the interstellar medium is investigated by a combined experimental and density function theory study of the superhydrogenation of coronene (C 24H12). The calculations suggest efficient hydrogenation of both edge and centre sites, along with competing abstraction reactions to form H2 in a series of catalytic cycles. Scanning tunneling microscopy and thermal desorption measurements have been used to provide direct evidence of the formation of superhydrogenated coronene as a result of exposure to D atoms. Lower limit estimates for the cross-sections of 1.8 × 10 -17, 5.5 × 10-18 and 1.1 × 10-18 cm2 for the formation of singly, doubly and triply hydrogenated coronene are derived. The results suggest that superhydrogenated PAHs may play an important role in H2 formation in the ISM.

Original languageEnglish
JournalE A S Publications Series
Pages (from-to)453-460
Number of pages8
ISSN1633-4760
DOIs
Publication statusPublished - 2011
EventPAHs and the Universe: A Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis - Toulouse, France
Duration: 31 May 20104 Jun 2010

Conference

ConferencePAHs and the Universe: A Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis
CountryFrance
CityToulouse
Period31/05/201004/06/2010

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