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Various Aspects of the Spectroscopy of PAHs (Polycyclic Aromatic Hydrocarbons)

Published online by Cambridge University Press:  30 March 2016

Philippe Bréchignac
Philippe Bréchignac*
Affiliation:
Laboratoire de Photophysique Moléculaire, CNRS, Batiment 210, Université Paris-Sud, F-91405 ORSAY CEDEX (France)

Abstract

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The exploitation of the recent observations (in particular by ISO) of the near infrared emission bands (UIBs) requires a good knowledge of the spectroscopic properties of the main proposed carriers, i.e. the Polycyclic Aromatic Hydrocarbons, which are expected to act as efficient UV/visible to infrared free-flying light converters.

The charge state of the interstellar PAHs strongly affects their spectroscopy. The laboratory study of the electronic transitions of PAH cations in the gas phase enables to address important questions, like their possible contribution to the Diffuse Interstellar Bands (visible and near-IR absorption), and the mechanism responsible for electronic to vibrational intramolecular energy conversion.

Microcanonical simulations based on hybrid quantum/classical theoretical methods reveal how strongly affected are the infrared intensities by both the charge state and the vibrational temperature.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 12: Highlights of Astronomy. As presented at the XXIVth General Assembly of the IAU, 2000 , 2002 , pp. 44 - 47
Copyright
Copyright © Astronomical Society of Pacific 2002

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