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

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We present the first vacuum ultraviolet spectroscopic study of an interstellar ice analogue of a 1:100 benzene (C 6 H 6 ):carbon dioxide (CO 2 ) 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 C 6 H 6 :CO 2 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 1 E 1u1 A 1g , but with additional structure suggesting the formation of a benzene derivative.

TidsskriftRSC Advances
Sider (fra-til)5453-5459
Antal sider7
StatusUdgivet - 2019

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