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Poster communications

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

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-03017838
Contributor : Alexandre Marciniak <>
Submitted on : Saturday, November 21, 2020 - 4:10:22 PM
Last modification on : Tuesday, November 24, 2020 - 3:28:35 AM

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  • HAL Id : hal-03017838, version 1

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Marciniak Alexandre, Anthony Bonnamy, 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⟩

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