H2O2 photoproduction inside H2O and H2O:O2 ices at 20–140?K

摘要

We report the results of laboratory measurements of Hsub2/subOsub2/sub production inside thin (50?nm thickness) Hsub2/subO and Hsub2/subO:Osub2/sub ice samples irradiated by 121.6?nm photons at different temperatures. In the case of Hsub2/subO ice, Hsub2/subOsub2/sub is formed at the temperatures below 60 К. In the case of Hsub2/subO:Osub2/sub ice, Hsub2/subOsub2/sub is formed in the 20-140 К range. For Hsub2/subO:Osub2/sub?=?9:1 ice, we derived Hsub2/subOsub2/sub photochemical quantum yield as a function of sample irradiation temperature. The obtained data can be used for evaluation of Hsub2/subOsub2/sub photoproduction at the surface of astrophysical water ice bodies and inside the particles of Noctilucent Clouds in the Earth's atmosphere.