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

摘要

We report the results of laboratory measurements of H2O2 production inside thin (50 nm thickness) H2O and H2O:O2 ice samples irradiated by 121.6 nm photons at different temperatures. In the case of H2O ice, H2O2 is formed at the temperatures below 60 К. In the case of H2O:O2 ice, H2O2 is formed in the 20–140 К range. For H2O:O2 = 9:1 ice, we derived H2O2 photochemical quantum yield as a function of sample irradiation temperature. The obtained data can be used for evaluation of H₂O₂ photoproduction at the surface of astrophysical water ice bodies and inside the particles of Noctilucent Clouds in the Earth’s atmosphere.