Perchlorate radiolysis in silicate matrices and ice on Mars and Europa

Merkulova, A.Y.; Cheptsov, V.S.; Pavlov, A.K.; Lubkova, T.N.; Filatova, O.R.; Drozdova, O.Y.; Chumikov, A.E.; Lomasov, V.N.

Авторы: Merkulova A.Y., Cheptsov V.S., Pavlov A.K., Lubkova T.N., Filatova O.R., Drozdova O.Y., Chumikov A.E., Lomasov V.N.
Журнал: Icarus
Том: 450
Год издания: 2026
Издательство: Academic Press
Местоположение издательства: United States
Первая страница: 1
Последняя страница: 13
Номер статьи: 117002
DOI: 10.1016/j.icarus.2026.117002
Аннотация: Perchlorates have been detected in the composition of the Martian regolith, in the ice of Europa, and in lunar samples and meteorites. The study of perchlorate production and decomposition is crucial for understanding the geological and climatic evolution of planets and the conditions necessary for habitability. We present a series of experiments measuring the destruction of NaClO4 under electron radiation at a low temperature of 133 К in various Mars-analog matrices, including pure salt, perchlorate solutions, and silica-perchlorate mixtures. Our results demonstrate that perchlorate degradation (ClO4−) depend on the matrix composition and the amount of energy absorbed. Pure NaClO4 and dry silicate mixtures exhibited the highest decomposition yields, which decreased with increasing absorbed energy. For pure NaClO4, the radiation chemical yield decreased from ∼0.74 to ∼0.46 molecules/100 eV, and for the dry mixture of sand and 10% of perchlorate, the radiation chemical yield decreased from ∼1.33 to ∼1.1 molecules/100 eV. The ice samples exhibited suppressed radiolysis efficiency. Chlorate (ClO3−) was identified as the main radiolysis product, whereas chlorite (ClO2−) and chloride (Cl−) were not detected. Our results provide essential constraints for interpreting perchlorate persistence and potential biosignature degradation in planetary environments.
Добавил в систему: Чепцов Владимир Сергеевич

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