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Dehydrogenated coronene cations and interstellar extinction

Published online by Cambridge University Press:  01 February 2008

G. Malloci
Affiliation:
Istituto Nazionale di Astrofisica–Osservatorio Astronomico di Cagliari, Strada n.54, Loc. Poggio dei Pini, I–09012 Capoterra (CA)(Italy) email: [email protected], [email protected], [email protected]
G. Mulas
Affiliation:
Istituto Nazionale di Astrofisica–Osservatorio Astronomico di Cagliari, Strada n.54, Loc. Poggio dei Pini, I–09012 Capoterra (CA)(Italy) email: [email protected], [email protected], [email protected]
C. Cecchi–Pestellini
Affiliation:
Istituto Nazionale di Astrofisica–Osservatorio Astronomico di Cagliari, Strada n.54, Loc. Poggio dei Pini, I–09012 Capoterra (CA)(Italy) email: [email protected], [email protected], [email protected]
F. Useli–Bacchitta
Affiliation:
Centre d'Etude Spatiale des Rayonnements, CNRS et Université Paul Sabatier Toulouse 3, Observatoire Midi-Pyrénées, 9 Avenue du Colonel Roche, 31028 Toulouse cedex 04(France) email: [email protected], [email protected], [email protected]
A. Bonnamy
Affiliation:
Centre d'Etude Spatiale des Rayonnements, CNRS et Université Paul Sabatier Toulouse 3, Observatoire Midi-Pyrénées, 9 Avenue du Colonel Roche, 31028 Toulouse cedex 04(France) email: [email protected], [email protected], [email protected]
C. Joblin
Affiliation:
Centre d'Etude Spatiale des Rayonnements, CNRS et Université Paul Sabatier Toulouse 3, Observatoire Midi-Pyrénées, 9 Avenue du Colonel Roche, 31028 Toulouse cedex 04(France) email: [email protected], [email protected], [email protected]
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Abstract

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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

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