Diffusion-adsorption of Water Vapor in Chemically Activated Lunar Soil
Silicate grains on the lunar surface have a wide range of desorption energies due to activated surface sites that persist in the extreme vacuum of space. Two endmember models of adsorption are constructed that represent opposite extremes for the mobility of adsorbed H _2 O on the grain surface. Then...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
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| Series: | The Planetary Science Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/PSJ/ade5b2 |
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| Summary: | Silicate grains on the lunar surface have a wide range of desorption energies due to activated surface sites that persist in the extreme vacuum of space. Two endmember models of adsorption are constructed that represent opposite extremes for the mobility of adsorbed H _2 O on the grain surface. Then, governing equations for diffusion are derived that take the range of desorption energies and the microroughness of the grains into account, two surface heterogeneities important on the lunar surface. One application of these equations is the prediction of the adsorbate profile above buried ice. Another application is the adsorbate profile when water is sourced from exospheric infall. In this case, adsorbate concentrations increase with depth as the temperature amplitude decays. |
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| ISSN: | 2632-3338 |