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Title: | Photolysis of Acetonitrile in a Water-rich Ice as a Source of Complex Organic Molecules: CH3CN and H2O:CH3CN Ices |
Authors: | Bulak, M. Paardekooper, D. M. Fedoseev, G. Linnartz, H. |
Issue Date: | 2021 |
Publisher: | EDP Sciences EDP Sciences |
Citation: | Photolysis of Acetonitrile in a Water-rich Ice as a Source of Complex Organic Molecules: CH3CN and H2O:CH3CN Ices / M. Bulak, D. M. Paardekooper, G. Fedoseev et al. — DOI 10.1073/pnas.2100338118 // Astronomy and Astrophysics. — 2021. — Vol. 647. — A82. |
Abstract: | Context. Many C-, O-, and H-containing complex organic molecules (COMs) have been observed in the interstellar medium (ISM) and their formation has been investigated in laboratory experiments. An increasing number of recent detections of large N-bearing COMs motivates our experimental investigation of their chemical origin. Aims. We investigate the potential role of acetonitrile (CH3CN) as a parent molecule to N-bearing COMs, motivated by its omnipresence in the ISM and structural similarity to another well-known precursor species, CH3OH. The aim of the present work is to characterize the chemical complexity that can result from vacuum UV photolysis of a pure CH3CN ice and a more realistic mixture of H2O:CH3CN. Methods. The CH3CN ice and H2O:CH3CN ice mixtures were UV irradiated at 20 K. Laser desorption post ionization time-of-flight mass spectrometry was used to detect the newly formed COMs in situ. We examined the role of water in the chemistry of interstellar ices through an analysis of two different ratios of H2O:CH3CN (1:1 and 20:1). Results. We find that CH3CN is an excellent precursor to the formation of larger nitrogen-containing COMs, including CH3CH2CN, NCCN/CNCN, and NCCH2CH2CN. During the UV photolysis of H2O:CH3CN ice, the water derivatives play a key role in the formation of molecules with functional groups of: imines, amines, amides, large nitriles, carboxylic acids, and alcohols. We discuss possible formation pathways for molecules recently detected in the ISM. © ESO 2021. |
Keywords: | ASTROCHEMISTRY CIRCUMSTELLAR MATTER ISM: MOLECULES METHODS: LABORATORY: SOLID STATE MOLECULAR PROCESSES ULTRAVIOLET: ISM ACETONITRILE AMIDES AMINES CHEMICAL DETECTION MASS SPECTROMETRY MIXTURES MOLECULES PHOTOLYSIS ULTRAVIOLET LASERS CHEMICAL COMPLEXITY COMPLEX ORGANIC MOLECULES EXPERIMENTAL INVESTIGATIONS FORMATION PATHWAYS IN-LABORATORY EXPERIMENTS INTERSTELLAR ICE INTERSTELLAR MEDIUMS STRUCTURAL SIMILARITY ICE |
URI: | http://elar.urfu.ru/handle/10995/111572 |
Access: | info:eu-repo/semantics/openAccess |
SCOPUS ID: | 85102446354 |
WOS ID: | 000629649800001 |
PURE ID: | 21031875 |
ISSN: | 0004-6361 |
DOI: | 10.1051/0004-6361/202039695 |
metadata.dc.description.sponsorship: | Acknowledgements. M.B. and H.L. acknowledge the European Union (EU) and Horizon 2020 funding awarded under the Marie Skłodowska-Curie action to the EUROPAH consortium (grant number 722346) as well as NOVA 5 funding. Additional funding has been realized through a NWO-VICI grant. This work has been supported by the Danish National Research Foundation through the Center of Excellence “InterCat” (Grant agreement no.: DNRF150). We thank N. F. W. Ligterink, A. G. G. M. Tielens, J. Terwischa van Scheltinga, J. Bouwman and T. Lamberts for helpful discussions. |
CORDIS project card: | H2020: 722346 |
Appears in Collections: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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