VUV photo processing of large cationic PAHs in astrophysical conditions: coupling a VUV source to the PIRENEA setup - Archive ouverte HAL Accéder directement au contenu
Poster De Conférence Année : 2020

VUV photo processing of large cationic PAHs in astrophysical conditions: coupling a VUV source to the PIRENEA setup

Résumé

Studying the interaction of polycyclic aromatic hydrocarbons (PAHs) with UV and VUV light is crucial for the understanding of the physical and chemical evolution of the interstellar medium. Photo-processing by VUV irradiation leads to variation of the hydrogenation and ionization states of PAHs [1] and plays an important role in the heating of the gas [2]. Recent laboratory studies have shown that the VUV photoexcitation of large PAHs rather induces further ionization than fragmentation [3,4] and, more surprisingly, it can also induce non-statistical dissociation [5]. We have recently coupled a VUV source based on a Xe-Ar tripling cell to the PIRENEA (Piège à Ions pour la Recherche et l’Etude de Nouvelles Espèces Astrochimiques) setup which consists of a cryogenic (35 K) ion cyclotron resonance cell that is especially well suited to investigate ionization and dissociation on long timescales [1,5]. The produced VUV photons (10.5 eV) are sufficiently energetic to trigger dissociation in small/medium-size PAHs [6] and ionization in large PAH cations [4]. We present first measurements of VUV processing of several PAHs in a cryogenic and collisionless environment which is appropriate for interstellar conditions.
Fichier principal
Vignette du fichier
Poster_GdR_EMIE2020_ALexandre_MARCINIAK.pdf (1.23 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03017838 , version 1 (21-11-2020)

Identifiants

  • HAL Id : hal-03017838 , version 1

Citer

Anthony Bonnamy, Alexandre Marciniak, Gabi Wenzel, Sébastien Zamith, Sabela Quiroga, et al.. VUV photo processing of large cationic PAHs in astrophysical conditions: coupling a VUV source to the PIRENEA setup. GdR EMIE, Oct 2020, Ile d'Oléron, France. ⟨hal-03017838⟩
136 Consultations
36 Téléchargements

Partager

Gmail Facebook X LinkedIn More