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Superhydrogenated PAHs: Catalytic formation of H2

Published online by Cambridge University Press:  30 March 2011

C. Joblin ,
A.G.G.M. Tielens ,
J.D. Thrower ,
L. Nilsson ,
B. Jørgensen ,
S. Baouche ,
R. Balog ,
A.C. Luntz ,
I. Stensgaard  and
E. Rauls
...Show all authors
J.D. Thrower
Affiliation:
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark. e-mail: [email protected]
L. Nilsson
Affiliation:
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark. e-mail: [email protected]
B. Jørgensen
Affiliation:
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark. e-mail: [email protected]
S. Baouche
Affiliation:
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark. e-mail: [email protected]
R. Balog
Affiliation:
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark. e-mail: [email protected]
A.C. Luntz
Affiliation:
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark. e-mail: [email protected]
I. Stensgaard
Affiliation:
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark. e-mail: [email protected]
E. Rauls
Affiliation:
Department of Theoretical Physics, Faculty of Natural Sciences, University of Paderborn, 33098 Paderborn, Germany
L. Hornekær
Affiliation:
Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark. e-mail: [email protected]

Abstract

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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 (C24H12). 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.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 46: PAHs and the Universe: A Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis , 2011 , pp. 453 - 460
Copyright
© EAS, EDP Sciences 2011

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