Studies of Isotopic Fractionation of D/H Water Ice in Lunar Regolith

V. S. Sevastyanov; Севастьянов В. С.; А. P. Krivenkо; Кривенко А. П.; S. А. Voropaev; Воропаев С. А.; M. Ya. Marov; Маров М. Я.

doi:10.31857/S0320930X23060063

Studies of Isotopic Fractionation of D/H Water Ice in Lunar Regolith

Authors: Sevastyanov V.S.¹, Krivenkо А.P.², Voropaev S.А.², Marov M.Y.³
Affiliations:
1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, Russia
2. Vernadsky Institute of Geochemistry and Analytical Chemistry of Russian Academy of Sciences
3. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991, Moscow, Russia
Issue: Vol 57, No 6 (2023)
Pages: 491-502
Section: Articles
URL: https://journals.rcsi.science/0320-930X/article/view/148070
DOI: https://doi.org/10.31857/S0320930X23060063
EDN: https://elibrary.ru/CVUIKG
ID: 148070

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Abstract

In order to study the processes related to the origin and retention of water on the surface of the Moon, an experimental setup has been created at the Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences (GEOKHI RAS), for the analysis of (re)sublimation processes of water ice in a vacuum at low temperatures. The temperature range for (re)sublimation varies from –100 to 0°C. The setup is connected to an Isotope Ratio Mass Spectrometer (IRMS), which allows for measuring the isotopic composition of the vapor of the evaporating substance and providing an estimation of the (re)sublimation rate under specific physicochemical conditions. The direct introduction of gases into the mass spectrometer in real-time mode sets the developed setup apart from foreign counterparts. The setup is equipped with a transparent quartz window through which the surface of the studied substance can be heated using a halogen lamp, simulating the movement of solar rays on the surface of mineral grain compositions under conditions similar to those on the lunar surface. In addition to studying gas (de)sorption on the surfaces of mineral grains of various compositions, the setup can also be used for researching the (re)sublimation of gas hydrates and CO2.

Keywords

isotopy, fractionation, water, ice, sublimation

References

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