ИСТИНА

The noble-gas hydrides HNgY (where Ng is a noble-gas and Y is an electronegative fragment) were discovered in 1995 [1]. In general, hydrogen atoms, which play key role in formation of noble-gas hydrides, can be generated by photolysis or radiolysis of HY in noble-gas matrices. These methods produce different spatial distribution of reactive fragments [2], which may affect the reaction yields and significance of side channels. Also, the electronic properties of matrix are more important in the case of radiolysis [3]. Up to now, the radiolysis method was used only for xenon hydrides. In this work we report the studies on kinetics and mechanism of formation of some krypton hydrides from the radiation-induced H atoms. The matrix deposited samples were irradiated with X-rays (30 keV) at 7 K and annealed carefully at different temperatures. Using a combination of IR and EPR spectroscopy, we have monitored the annealing behavior of the species produced in the C2H2/Kr system (H, HKrCCH, C2H, C2H3, C2H2 and C2H4). From the comparison of IR and EPR results it was found that, at least 20-25% of radiolytic H for the formation of HKrCCH. Also, the kinetics of formation of HKrCl from the HCl/Kr system was monitored at 24 – 27 K and compared with available data on UV-photolysis [4]. Finally, the radiolysis products of phenylacetylene in solid krypton matrix were studied in attempt to prepare a new krypton hydride. This work was supported by the Russian Foundation for Basic Research (grant no 12-03-31559).