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Low-temperature condensation of carbonaceous dust grains from PAHs

Published online by Cambridge University Press:  12 October 2020

Lisseth Gavilan Marin Open the ORCID record for Lisseth Gavilan Marin [Opens in a new window] ,
Salma Bejaoui Open the ORCID record for Salma Bejaoui [Opens in a new window] ,
Gregory Gate ,
Michael Haggmark ,
Nathan Svadlenak ,
Mattanjah de Vries ,
Ella Sciamma-O’Brien Open the ORCID record for Ella Sciamma-O’Brien [Opens in a new window]  and
Farid Salama Open the ORCID record for Farid Salama [Opens in a new window]
Lisseth Gavilan Marin
Affiliation:
NASA Ames Research Center, Space Science & Astrobiology Division, Moffett Field, CA 94035, USA email: lisseth.gavilanmarin@nasa.gov
Salma Bejaoui
Affiliation:
NASA Ames Research Center, Space Science & Astrobiology Division, Moffett Field, CA 94035, USA email: lisseth.gavilanmarin@nasa.gov
Gregory Gate
Affiliation:
Department of Chemistry, University of California Santa Barbara, CA 93106, USA
Michael Haggmark
Affiliation:
Department of Chemistry, University of California Santa Barbara, CA 93106, USA
Nathan Svadlenak
Affiliation:
Department of Chemistry, University of California Santa Barbara, CA 93106, USA
Mattanjah de Vries
Affiliation:
Department of Chemistry, University of California Santa Barbara, CA 93106, USA
Ella Sciamma-O’Brien
Affiliation:
NASA Ames Research Center, Space Science & Astrobiology Division, Moffett Field, CA 94035, USA email: lisseth.gavilanmarin@nasa.gov
Farid Salama
Affiliation:
NASA Ames Research Center, Space Science & Astrobiology Division, Moffett Field, CA 94035, USA email: lisseth.gavilanmarin@nasa.gov
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Abstract

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Interstellar carbon has been detected in both gas-phase molecules and solid particles. The goal of this study is to identify the link between these two phases of cosmic carbon. Here we report preliminary results on the low temperature formation of carbonaceous dust grains from gas-phase aromatic hydrocarbon precursors. This is done using the supersonic expansion of an argon jet seeded with aromatic molecules and exposed to an electrical discharge. We report experimental evidence of efficient carbon dust condensation from aromatic molecules including benzene and naphthalene. The molecular content of the solid grains is probed with laser desorption mass spectrometry. The mass spectra reveal a rich molecular composition including fragments of the parent molecule but also growth into larger molecular species.

Keywords

astrochemistrymolecular processesplasmasmethods: laboratoryISM: jets and outflowsISM: molecules
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S350: Laboratory Astrophysics: From Observations to Interpretation , April 2019 , pp. 465 - 467
Copyright
© International Astronomical Union 2020

References

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