Kinetics and mechanism of the radiation-chemical synthesis of krypton hydrides in solid krypton matrices

The processes occurring in the X-irradiated C₂H₂/Kr and HCl/Kr systems in the temperature range of 7–30 K were studied using a combination of FTIR and EPR spectroscopy. In both cases, irradiation results in effective decomposition of isolated molecules (C₂H₂ or HCl) and production of trapped H atoms. The thermal decay of trapped atoms in solid krypton was attributed to "local" reactions (below 21 K) and long-range mobility activated in the temperature range of 23–27 K. Two krypton hydrides, HKrCCH and HKrCl, were synthesized from the radiation-induced hydrogen atoms. In the case of C₂H₂/Kr system, competitive reaction channels of H atoms at various absorbed doses were investigated in details, and HKrCCH was found to be one of the main reaction products. The X-ray radiolysis in krypton matrices was concluded to be a promising method to obtain krypton hydrides. - Highlights: • Reactions of radiolytic H atoms in solid krypton were monitored by EPR and FTIR spectroscopy. • The role of "local" and "global" mobility of H atoms was established. • HKrCCH and HKrCl were prepared by the radiation-chemical method