Application of thermodesorption mass spectrometry for studying proton water formation in the lunar regolith

Slyuta, E. N.; Petrov, V. S.; Yakovlev, O. I.; Воропаев, С. А.; Monakhov, I. S.; Прокофьева, Т.В.

doi:10.1134/s0016702916130188

Cited by 5 publications

(2 citation statements)

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“…The activation energies of desorption of physisorbed and chemisorbed water on lunar regolith samples and analogues were measured to be 144-158 kJ mol −1 (refs. 45,46 ). This threshold energy can be delivered by shock pressures as low as 100 MPa.…”

Section: Source Of the Released Watermentioning

confidence: 99%

Lunar soil hydration constrained by exospheric water liberated by meteoroid impacts

et al. 2019

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Analyses of samples from the Apollo missions suggest that the Moon formed devoid of native water. However, recent observations by Cassini, Deep Impact, Lunar Prospector and Chandrayaan-1 indicate the existence of an active water cycle on the Moon. Here we report observations of this water cycle, specifically detections of near-surface water released into the lunar exosphere by the Neutral Mass Spectrometer on the Lunar Atmosphere and Dust Environment Explorer. The timing of 29 water releases is associated with the Moon encountering known meteoroid streams. The intensities of these releases reflect the convoluted effects of the flux, velocity and impact location of the parent streams. We propose that four additional detected water releases represent the signature of previously undiscovered meteoroid streams. We show that water release from meteoroid impacts is indicative of a lunar surface that has a desiccated soil layer of several centimetres on top of uniformly hydrated soil. We infer that the Moon is currently in the process of losing water that was either delivered long ago or present at its formation.

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Section: Source Of the Released Watermentioning

confidence: 99%

Lunar soil hydration constrained by exospheric water liberated by meteoroid impacts

et al. 2019

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“…Despite the importance of understanding the chemisorbed states of water on lunar regolith, only one study thus far has measured the binding energies of actual lunar material (Poston et al, 2015). Water adsorption and desorption behavior has been reported for several analogues including: lunar simulant JSC-1A (Goering et al, 2008), mechanically micronized JSC-1A and albite (Poston et al, 2013), on various mineral surfaces found on lunar soil grains (Hibbitts et al, 2011), and proton irradiated quartz (Slyuta et al, 2017). Here, we present direct measurement and analysis of binding energies and site distribution profiles of chemisorbed water on two additional lunar materials: highland reference sample 14163 and mare reference sample 10084.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Water Interactions With Apollo Lunar Regolith Grains

et al. 2020

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Desorption activation energies of chemisorbed water on Apollo lunar Samples 14163 and 10084 were determined by temperature program desorption (TPD) experiments conducted under ultrahigh vacuum conditions. Desorption at the grain/vacuum interface and desorption/transport of water though the porous medium with readsorption were found to reproduce the experimental TPD signal. Signal from the grain/vacuum interface yielded desorption activation energies and site probability distributions. Highland sample 14163 exhibited a broad distribution of binding site energies peaking at 60 kJ mol−1, while mare sample 10084 exhibited a narrower distribution of binding site energies peaking at 65 kJ mol−1. The highland sample adsorbed approximately 30% more water than the more space weathered and mature mare sample, suggesting maturity may not be a good predictor of the degree of molecular water uptake on lunar regolith. Water desorption from the lunar surface over a typical lunar day was simulated with the measured coverage‐dependent activation energies of the mare and highland samples. The resulting desorption profile of water through a lunar temperature cycle is in general agreement with Lunar Reconnaissance Orbiter (LRO) Lyman‐α Mapping Project (LAMP) spacecraft‐based observations of trends for both highland and mare assuming ~1% submonolayer coverage and that photon stimulated desorption is neglected.

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Helium-3 in the Lunar Soil

Slyuta

Turchinskaya

2023

Advances in Geochemistry, Analytical Chemistry, and Planetary Sciences

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Application of thermodesorption mass spectrometry for studying proton water formation in the lunar regolith

Cited by 5 publications

References 13 publications

Lunar soil hydration constrained by exospheric water liberated by meteoroid impacts

Lunar soil hydration constrained by exospheric water liberated by meteoroid impacts

Investigation of Water Interactions With Apollo Lunar Regolith Grains

Helium-3 in the Lunar Soil

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