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VUV spectroscopy of an electron irradiated benzene : carbon dioxide interstellar ice analogue

James, Rachel L.; Jones, Nykola C.; Hoffmann, Søren V. and Dawes, Anita (2019). VUV spectroscopy of an electron irradiated benzene : carbon dioxide interstellar ice analogue. RSC Advances, 9(10) pp. 5453–5459.

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We present the first vacuum ultraviolet spectroscopic study of an interstellar ice analogue of a 1 : 100 benzene (C6H6) : carbon dioxide (CO2) mixture which has been energetically processed with 1 keV electrons. We have exploited the fact that benzene has a relatively high photoabsorption cross section in the vacuum ultraviolet region to study this dilute mixture of benzene. Before irradiation with 1 keV electrons, we observed that the benzene electronic transition bands in the C6H6 : CO2 mixture exhibits a blueshift in band position towards energies observed in the gas-phase compared with that of pure, amorphous benzene and we have attributed this to a matrix isolation effect. After irradiation, a lowering in intensity of both the carbon dioxide and benzene electronic transition bands was observed, as well as the formation of the small irradiation product, carbon monoxide. A residue was obtained at 200 K which showed characteristic features of the benzene electronic transition of 1E1u1A1g, but with additional structure suggesting the formation of a benzene derivative.

Item Type: Journal Item
Copyright Holders: 2019 The Royal Society of Chemistry
ISSN: 2046-2069
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 59251
SWORD Depositor: Jisc Publications-Router
Depositing User: Jisc Publications-Router
Date Deposited: 25 Feb 2019 11:25
Last Modified: 31 Mar 2019 05:25
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