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Swift heavy ion irradiation of interstellar dust analogues

Dartois, E. and Chabot, M. and Pino, T. and Béroff, K. and Godard, M. and Severin, D. and Bender, M. and Trautmann, C. (2017):
Swift heavy ion irradiation of interstellar dust analogues.
In: Astronomy & Astrophysics, A & A, pp. A130, 599, ISSN 0004-6361,
DOI: 10.1051/0004-6361/201629646,
[Online-Edition: https://doi.org/10.1051/0004-6361/201629646],
[Article]

Abstract

Context. Interstellar dust grain particles are immersed in vacuum ultraviolet (VUV) and cosmic ray radiation environments influencing their physicochemical composition. Owing to the energetic ionizing interactions, carbonaceous dust particles release fragments that have direct impact on the gas phase chemistry.

Aims. The exposure of carbonaceous dust analogues to cosmic rays is simulated in the laboratory by irradiating films of hydrogenated amorphous carbon interstellar analogues with energetic ions. New species formed and released into the gas phase are explored.

Methods. Thin carbonaceous interstellar dust analogues were irradiated with gold (950 MeV), xenon (630 MeV), and carbon (43 MeV) ions at the GSI UNILAC accelerator. The evolution of the dust analogues is monitored in situ as a function of fluence at 40, 100, and 300 K. Effects on the solid phase are studied by means of infrared spectroscopy complemented by simultaneously recording mass spectrometry of species released into the gas phase.

Results. Specific species produced and released under the ion beam are analyzed. Cross sections derived from ion-solid interaction processes are implemented in an astrophysical context.

Item Type: Article
Erschienen: 2017
Creators: Dartois, E. and Chabot, M. and Pino, T. and Béroff, K. and Godard, M. and Severin, D. and Bender, M. and Trautmann, C.
Title: Swift heavy ion irradiation of interstellar dust analogues
Language: English
Abstract:

Context. Interstellar dust grain particles are immersed in vacuum ultraviolet (VUV) and cosmic ray radiation environments influencing their physicochemical composition. Owing to the energetic ionizing interactions, carbonaceous dust particles release fragments that have direct impact on the gas phase chemistry.

Aims. The exposure of carbonaceous dust analogues to cosmic rays is simulated in the laboratory by irradiating films of hydrogenated amorphous carbon interstellar analogues with energetic ions. New species formed and released into the gas phase are explored.

Methods. Thin carbonaceous interstellar dust analogues were irradiated with gold (950 MeV), xenon (630 MeV), and carbon (43 MeV) ions at the GSI UNILAC accelerator. The evolution of the dust analogues is monitored in situ as a function of fluence at 40, 100, and 300 K. Effects on the solid phase are studied by means of infrared spectroscopy complemented by simultaneously recording mass spectrometry of species released into the gas phase.

Results. Specific species produced and released under the ion beam are analyzed. Cross sections derived from ion-solid interaction processes are implemented in an astrophysical context.

Journal or Publication Title: Astronomy & Astrophysics
Volume: 599
Publisher: A & A
Uncontrolled Keywords: astrochemistry, cosmic rays, dust, extinction, Evolution, solid state: refractory, methods: laboratory: solid state
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Ion-Beam-Modified Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 29 Dec 2017 09:52
DOI: 10.1051/0004-6361/201629646
Official URL: https://doi.org/10.1051/0004-6361/201629646
Funders: Part of this work has been financed by the French INSU-CNRS program “Physique et Chimie du Milieu Interstellaire” (PCMI).
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