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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| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | The Planetary Science Journal |
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| Online Access: | https://doi.org/10.3847/PSJ/ade5b2 |
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| _version_ | 1849721112882053120 |
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| author | Norbert Schörghofer |
| author_facet | Norbert Schörghofer |
| author_sort | Norbert Schörghofer |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-2a3e39575655485ba0422d487eeed444 |
| institution | DOAJ |
| issn | 2632-3338 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Planetary Science Journal |
| spelling | doaj-art-2a3e39575655485ba0422d487eeed4442025-08-20T03:11:46ZengIOP PublishingThe Planetary Science Journal2632-33382025-01-016716410.3847/PSJ/ade5b2Diffusion-adsorption of Water Vapor in Chemically Activated Lunar SoilNorbert Schörghofer0https://orcid.org/0000-0002-5821-4066Planetary Science Institute , Tucson, AZ 85719, USA; Planetary Science Institute , Honolulu, HI 96822, USASilicate 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.https://doi.org/10.3847/PSJ/ade5b2The MoonLunar surfaceLunar regolithAstrochemistryWater vapor |
| spellingShingle | Norbert Schörghofer Diffusion-adsorption of Water Vapor in Chemically Activated Lunar Soil The Planetary Science Journal The Moon Lunar surface Lunar regolith Astrochemistry Water vapor |
| title | Diffusion-adsorption of Water Vapor in Chemically Activated Lunar Soil |
| title_full | Diffusion-adsorption of Water Vapor in Chemically Activated Lunar Soil |
| title_fullStr | Diffusion-adsorption of Water Vapor in Chemically Activated Lunar Soil |
| title_full_unstemmed | Diffusion-adsorption of Water Vapor in Chemically Activated Lunar Soil |
| title_short | Diffusion-adsorption of Water Vapor in Chemically Activated Lunar Soil |
| title_sort | diffusion adsorption of water vapor in chemically activated lunar soil |
| topic | The Moon Lunar surface Lunar regolith Astrochemistry Water vapor |
| url | https://doi.org/10.3847/PSJ/ade5b2 |
| work_keys_str_mv | AT norbertschorghofer diffusionadsorptionofwatervaporinchemicallyactivatedlunarsoil |