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[FePAH]+ complexes and [FexPAHy]+ clusters in the interstellar medium: stability and spectroscopy

Published online by Cambridge University Press:  30 March 2011

C. Joblin ,
A.G.G.M. Tielens ,
A. Simon ,
M. Rapacioli ,
F. Spiegelman  and
C. Joblin
A. Simon
Affiliation:
Université de Toulouse, UPS, LCPQ (Laboratoire de Chimie et Physique Quantiques), IRSAMC, 118 Route de Narbonne, 31062 Toulouse, France CNRS, LCPQ, IRSAMC, 31062 Toulouse, France
M. Rapacioli
Affiliation:
Université de Toulouse, UPS, LCPQ (Laboratoire de Chimie et Physique Quantiques), IRSAMC, 118 Route de Narbonne, 31062 Toulouse, France CNRS, LCPQ, IRSAMC, 31062 Toulouse, France
F. Spiegelman
Affiliation:
Université de Toulouse, UPS, LCPQ (Laboratoire de Chimie et Physique Quantiques), IRSAMC, 118 Route de Narbonne, 31062 Toulouse, France CNRS, LCPQ, IRSAMC, 31062 Toulouse, France
C. Joblin
Affiliation:
Université de Toulouse, UPS, Centre d’Étude Spatiale des Rayonnements (CESR), Observatoire Midi-Pyrénées, 9 AV. Colonel Roche, 31028 Toulouse Cedex 04, France CNRS, CESR, 31028 Toulouse, France

Abstract

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The relevance of organometallic complexes in the chemistry of the interstellar medium (ISM) was first suggested in the early 90s. This initial proposal has recently been re-considered in the light of new astronomical data, benefiting from pioneering experimental techniques and theoretical methods. In this article, a review of recent theoretical and experimental results obtained for PAHs coordinated to Fe atoms is presented, focusing on: -(i)- the IR spectra of [FePAH]+ and [Fe(PAH)2]+ complexes, found to be in line with the AIBs, with additional specific features in the far-IR range and -(ii)- the photo-evaporation of [FexPAHy]+ clusters as possible candidates for very small grains releasing PAHs in photodissociation regions. These results call for new astronomical data at high spatial resolution. Studies on larger clusters will require further experimental and theoretical developments.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 46: PAHs and the Universe: A Symposium to Celebrate the 25th Anniversary of the PAH Hypothesis , 2011 , pp. 441 - 446
Copyright
© EAS, EDP Sciences 2011

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