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A Novel Approach to the Detection and Characterization of PAH Cations and PAH-Photoproducts

Published online by Cambridge University Press:  21 February 2014

D. L. Kokkin ,
A. Simon ,
C. Marshall ,
A. Bonnamy  and
C. Joblin
D. L. Kokkin
Affiliation:
IRAP, Université de Toulouse (UPS-OMP) and CNRS; 9 Av. du Colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France email: [email protected]
A. Simon
Affiliation:
LCPQ, Université de Toulouse (UPS-IRSAMC) and CNRS; 118 Route de Narbonne, 31062 Toulouse Cedex 09, France
C. Marshall
Affiliation:
IRAP, Université de Toulouse (UPS-OMP) and CNRS; 9 Av. du Colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France email: [email protected]
A. Bonnamy
Affiliation:
IRAP, Université de Toulouse (UPS-OMP) and CNRS; 9 Av. du Colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France email: [email protected]
C. Joblin
Affiliation:
IRAP, Université de Toulouse (UPS-OMP) and CNRS; 9 Av. du Colonel Roche, BP 44346, 31028 Toulouse Cedex 4, France email: [email protected]
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Abstract

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Cationic polycyclic aromatic hydrocarbons (PAHs) are attractive candidates for the Diffuse Interstellar Bands, but to date not a single PAH species has been identified on the basis of a spectral agreement. This indicates either that the molecular diversity is very large or that the candidates that have been considered are not the correct ones. In particular, small/medium-sized PAH cations are submitted to photodissociation under UV photons from stars. Therefore it is of interest to characterize the spectroscopic properties of key breakdown products. Furthermore, these studies should be performed under conditions that mimic those found in interstellar space, which leads to additional experimental difficulties. We describe the approach we are developing with the PIRENEA set-up and present results on the 1-Methylpyrene cation and photo-derived species. Experimental measurements are guided by calculations based on density functional theory.

Keywords

astrochemistrymethods: laboratorytechniques: spectroscopicISM: molecules
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 286 - 290
Copyright
Copyright © International Astronomical Union 2014 

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