Abstract
The neutral reaction products formed during electron beam irradiation of carbon tetrachloride/water (ice) films have been studied as a function of the film's initial CCl4 ∶ H2O ratio using a combination of reflection absorption infrared spectroscopy, mass spectrometry and X-ray photoelectron spectroscopy. When the initial CCl4 ∶ H2O ratio was high, the dominant reaction products in the film were C2Cl4 and a partially chlorinated carbonaceous film (CClx) formed as the result of carbon–carbon coupling reactions in the film. In these CCl4 rich films, chlorine is partitioned mainly into the gas phase while CO is the dominant carbon-containing gas phase species. As the CCl4 ∶ H2O ratio decreases, CO2 becomes an increasingly important reaction product at the expense of species generated from carbon–carbon coupling reactions, while chlorine is increasingly partitioned as HCl in the film, producing H3O+ and Cl−. The production of both H2 and O2 from electron stimulated reactions associated with H2O are suppressed in CCl4/H2O films, although oxygen is more efficiently quenched in the presence of CCl4.
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