Release of large polycyclic aromatic hydrocarbons and fullerenes by cosmic rays from interstellar dust - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2019

Release of large polycyclic aromatic hydrocarbons and fullerenes by cosmic rays from interstellar dust

Résumé

Context. Top-down chemistry is believed to be responsible for the formation of the large molecular compounds such as the polycyclic aromatic hydrocarbon-like molecules and the fullerenes observed in the interstellar medium. The release of these large molecules from the parent grains remains an important issue to be investigated. Aims. Cosmic rays irradiate the dust grains during their journey in the interstellar medium. In this study we probe to what extent electronic sputtering and/or desorption processes induced by high-energy ion projectiles contribute to the creation of the large molecular component in space. Methods. Carbonaceous dust analogues were produced in an ethylene flame. The resulting soot nanoparticles generated under well-defined conditions were irradiated by swift heavy ions, and mass spectra of the ionic and neutral molecular fragments emitted shortly after the impact were monitored. Results. Large molecular fragments were detected, including neutral and ionic polycyclic aromatic hydrocarbons containing up to several tens of carbon atoms, as well as ionic fullerenes. Although the absolute efficiencies were not obtained, these experiments provide a proof of principle of a top-down scenario involving interaction processes of interstellar dust with high-energy projectiles yielding large molecular compounds observed in space.
Fichier principal
Vignette du fichier
aa34855-18.pdf (414.12 Ko) Télécharger le fichier
Origine : Publication financée par une institution
Loading...

Dates et versions

hal-02097430 , version 1 (21-08-2020)

Identifiants

Citer

T. Pino, M. Chabot, K. Béroff, M. Godard, F. Fernandez-Villoria, et al.. Release of large polycyclic aromatic hydrocarbons and fullerenes by cosmic rays from interstellar dust. Astronomy and Astrophysics - A&A, 2019, 623, pp.A134. ⟨10.1051/0004-6361/201834855⟩. ⟨hal-02097430⟩
73 Consultations
40 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More