Dehydrogenated coronene cations and interstellar extinction

Details Dehydrogenated coronene cations and interstellar extinction Dehydrogenated coronene cations and interstellar extinction

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..251...75m&link_type=abstract

Organic Matter in Space, Proceedings of the International Astronomical Union, IAU Symposium, Volume 251, p. 75-76

Astronomy and Astrophysics

Astronomy

Astrochemistry, (Ism:) Dust, Extinction, Ultraviolet: Ism, Molecular Data

Scientific paper

Dehydrogenated coronene molecules have been proposed as the carrier of the interstellar UV extinction bump and of some diffuse interstellar bands. To test this hypothesis, we have undertaken a combined a) theoretical and b) experimental work on the subject. a) We use the (time dependent) density functional theory to study the effect of hydrogenation on the UV absorption cross section of neutral and ionised coronene molecules. b) For the visible and near UV, these calculations provide useful guidelines to analyse and interpret the electronic spectra obtained with the PIRENEA experimental set-up dedicated to astrochemistry.

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