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Title: A New Method for Simulating Photoprocesses in Astrochemical Models
Authors: Mullikin, E.
Anderson, H.
O'Hern, N.
Farrah, M.
Arumainayagam, C. R.
Van, Dishoeck, E. F.
Gerakines, P. A.
Vasyunin, A. I.
Majumdar, L.
Caselli, P.
Shingledecker, C. N.
Issue Date: 2021
Publisher: IOP Publishing Ltd
Citation: A New Method for Simulating Photoprocesses in Astrochemical Models / E. Mullikin, H. Anderson, N. O'Hern, et al. — DOI 10.3847/1538-4357/abd778 // Astrophysical Journal. — 2021. — Vol. 910. — Iss. 1. — 72.
Abstract: We propose a new model for treating solid-phase photoprocesses in interstellar ice analogs. In this approach, photoionization and photoexcitation are included in more detail, and the production of electronically excited (suprathermal) species is explicitly considered. In addition, we have included nonthermal, nondiffusive chemistry to account for the low-temperature characteristic of cold cores. As an initial test of our method, we have simulated two previous experimental studies involving the UV irradiation of pure solid O2. In contrast to previous solid-state astrochemical model calculations, which have used gas-phase photoabsorption cross-sections, we have employed solid-state cross-sections in our calculations. This method allows the model to be tested using well-constrained experiments rather than poorly constrained gas-phase abundances in interstellar medium regions. Our results indicate that inclusion of nonthermal reactions and suprathermal species allows for reproduction of low-temperature solid-phase photoprocessing that simulates interstellar ices within cold (∼10 K) dense cores such as TMC-1. © 2021. The American Astronomical Society. All rights reserved.
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85103546534
WOS ID: 000633352900001
PURE ID: 21178724
ISSN: 0004637X
DOI: 10.3847/1538-4357/abd778
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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