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Laboratory Spectroscopy of Protonated PAH Molecules RelevantFor Interstellar Chemistry

Published online by Cambridge University Press:  30 March 2011

C. Joblin ,
A.G.G.M. Tielens  and
O. Dopfer
O. Dopfer*
Affiliation:
Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin, Germany;. e-mail: [email protected]

Abstract

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In this contribution, we summarize the recent progress made in recording laboratoryinfrared (IR) spectra of protonated polycyclic aromatic hydrocarbon molecules(H+PAH) in the gas phase. The IR spectra of a large variety ofH+PAH species ranging from benzene to coronene have been obtained by variousvariants of photodissociation spectroscopy. The employed techniques include single-photonIR photodissociation (IRPD) of tagged H+PAH ions and IR multiple-photondissociation (IRMPD) of bare H+PAH ions. The comparison of the laboratory IRspectra with astronomical spectra supports the hypothesis that H+PAH ions arepossible carriers of the unidentified IR emission (UIR) bands. Moreover, the spectraprovide detailed information about the geometric and electronic structure as well as thechemical reactivity and stability of these fundamental hydrocarbon ions.

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. 103 - 108
Copyright
© EAS, EDP Sciences 2011

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