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Experimental and Theoretical Study on the Ethane and Acetylene Formation from Electron Irradiation of Methane Ices

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Author(s): Marianna Barberio | Roberta Vasta | Pasquale Barone | Giulio Manicò | Fang Xu

Journal: World Journal of Condensed Matter Physics
ISSN 2160-6919

Volume: 03;
Issue: 01;
Start page: 14;
Date: 2013;
Original page

Keywords: Solid Ices | Ethane Formation | Acetylene Formation | Electron Irradiation

ABSTRACT
In this work we present an experimental and theoretical study on the formation of ethane and acetylene from solid methane condensed at 20 K and irradiated with a 500 - 3000 eV electron beam. The experiments were monitored with Thermal Desorption Spectroscopy. We observe that the electron irradiation induced a dehydrogenation of methane and a consequent formation of CHx (x = 1, 2, 3) fragments. Furthermore, in the solid during irradiation, a simple recombinetion reaction in the solid between two adjacent CHx molecules may form HC≡CH, H2C=CH2, and H3C-CH3 with a triple, double, and single carbon-carbon bond, respectively. The formed amount of ethane and acetylene increases with irradiation time and reaches a saturation value.  
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