An experimental study of hydrogen implantation to minerals: Role of the solar wind as a source of water in terrestrial bodies

Jiang, Qinting; Karato, Shun-ichiro; Bissbort, Thilo; Foteinou, Varvara

doi:10.1016/j.icarus.2024.115958

Cited by 2 publications

(2 citation statements)

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“…The concentration is naturally highest at the penetration depth, as the implantation rate is practically instantaneous. As the implantation profile is Gaussian (Jiang et al 2024), this creates a gradient sloping toward the surface and into the bulk. However, diffusion into the bulk is inhibited owing to the high activation energies, whereas diffusion in the implantation zone is enhanced by the radiation damage (Figure 1, I and II; Chen et al 1976Chen et al , 1977Gonzalez & Chen 2002).…”

Section: Ss ( ) ( ) [ ]mentioning

confidence: 99%

“…Fick's law then depicts the net transport of these defects, which is dictated by the local concentration gradient and the diffusion constant. The latter is described by a standard Arrhenius-type relationship with an exponential dependence on temperature, whereas the former can be described by a Gaussian function (Jiang et al 2024). Synthesis of molecular water subsequently follows the buildup of surficial hydroxyls, the rate of which is controlled by the local temperature, and follows a well-known pathway described by the mechanism of recombinative desorption (RD).…”

Section: Introductionmentioning

confidence: 99%

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Water Generation on the Moon from Solar Wind and Meteoroid Impacts

Jones,

Carrillo-Sánchez,

Janches

et al. 2024

Planet. Sci. J.

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The kinetics of water formation on the lunar surface from impact-driven melts (IM) of meteoroids and recombinative desorption (RD) of solar-wind-implanted regolith grains is assessed. The ratio of water generated from RD:IM is ultimately controlled by the diffusion constant of the implanted defects. Higher diffusion activation energies of hydroxyls (-OH) result in more trapping of the implanted defects and, consequently, higher water production from IM versus RD. At diffusion activation energies >1 eV, water production from RD is negligible and IM is the dominant channel. Our results suggest that RD can be associated with the observed latitude and diurnal dependence but RD and/or micrometeorite IM are not major contributors to the water ice observed within the permanently shadowed regions (PSRs). This suggests that volcanic and/or delivery via large impactors are the more likely major sources of water on the Moon. However, our model generally agrees with the observed latitudinal dependence of the inferred OH/H2O and the overall diurnal trend from orbital observations in the infrared. In addition, our results also suggest that micrometeorites are responsible for the high content of molecular water in the glass of regolith grains.

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