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Interaction of atomic hydrogen with carbongrains

Published online by Cambridge University Press:  30 March 2011

C. Joblin ,
A.G.G.M. Tielens  and
V. Mennella
V. Mennella*
Affiliation:
INAF-Osservatorio Astronomico di Capodimonte, Napoli, Italy

Abstract

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Laboratory studies on the interaction of atomic hydrogen with aliphatic and aromatichydrogenated carbon grains are discussed. When exposed to atomic hydrogen, both types ofhydrogenated carbon grains act as catalysts for molecular hydrogen formation. In the firstcase, an exchange reaction with hydrogen chemisorbed in aliphatic carbon sites is theformation route to H2 formation. For aromatic carbon grains, the formation ofmolecular hydrogen takes place through a two-step reaction sequence: 1) superhydrogenation of the aromatic carbon islands of grains 2) exchange reactions on theseislands. This mechanism represents a good approximation of molecular hydrogen formation onlarge neutral PAHs.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 46: PAHs and the Universe: A Symposium to Celebrate the 25thAnniversary of the PAH Hypothesis , 2011 , pp. 393 - 398
Copyright
© EAS, EDP Sciences 2011

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