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Laboratory analogs of carbonaceous matter: Soot and its precursors and by-products

Published online by Cambridge University Press:  01 February 2008

Cornelia Jäger ,
Harald Mutschke ,
Isabel Llamas-Jansa ,
Thomas Henning  and
Friedrich Huisken
Cornelia Jäger
Affiliation:
Laboratory Astrophysics Group of the Max PlanckInstitute for Astronomy at the Institute of Solid State Physics, Friedrich Schiller UniversityJena Helmholtzweg 3, 07743 Jena, Germany email: Cornelia.Jaeger@uni-jena.de
Harald Mutschke
Affiliation:
Astrophysical Institute and University Observatory, FSU Jena Schillergässchen 3, 07745 Jena, Germany
Isabel Llamas-Jansa
Affiliation:
Astrophysical Institute and University Observatory, FSU Jena Schillergässchen 3, 07745 Jena, Germany
Thomas Henning
Affiliation:
Max Planck Institute for AstronomyKönigstuhl 17, D-69117 Heidelberg, Germany
Friedrich Huisken
Affiliation:
Laboratory Astrophysics Group of the Max PlanckInstitute for Astronomy at the Institute of Solid State Physics, Friedrich Schiller UniversityJena Helmholtzweg 3, 07743 Jena, Germany email: Cornelia.Jaeger@uni-jena.de
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Abstract

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Carbonaceous materials have been prepared in the laboratory by laser-induced pyrolysis of a mixture of hydrocarbons under different conditions and laser ablation of graphite in reactive gas atmospheres. We have investigated the soluble and insoluble parts of the condensed carbon powders with several spectroscopic and chromatographic methods in order to obtain information on the composition of the condensate. The results of these experiments have demonstrated that, at temperatures lower than 1700 K, the pyrolysis by-products are mainly PAHs, whereas at higher temperatures fullerenes and polyyne-based compounds are formed. The experimental findings point to different soot formation mechanisms with variable intermediates and end products. It has been found that soot extracts can contain more than 65 different polycyclic aromatic hydrocarbons (PAHs). Eventually, the study of the condensation pathways of soot particles and their precursors and by-products will permit the prediction of the spectral properties of carbonaceous matter in space.

Keywords

Laboratorydustextinctioninfraredstars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 425 - 432
Copyright
Copyright © International Astronomical Union 2008

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