Organizational Unit:
School of Chemistry and Biochemistry

Permanent Link
https://hdl.handle.net/1853/70752
Research Organization Registry ID
Description
Previous Names
Parent Organization
Parent Organization
Organizational Unit
Includes Organization(s)
ArchiveSpace Name Record
https://finding-aids.library.gatech.edu/agents/corporate_entities/153

Filters

2021 - 2022 2
2
2
2
Reset filters

Settings
Start date: 2020 × End date: 2024 × Author: Aleksandrov, Aleksandr ×

Publication Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Temperature Programmed Desorption Comparison of Lunar Regolith to Lunar Regolith Simulants LMS-1 and LHS-1 - Data Files
    (Georgia Institute of Technology, 2022) Clendenen, Ashley Rebekah ; Aleksandrov, Aleksandr ; Jones, Brant M. ; Loutzenhiser, Peter G. ; Britt, Daniel T. ; Orlando, Thomas M.
    Water and molecular hydrogen evolution from Apollo sample 14163 and lunar regolith simulants LMS-1 and LHS-1 were examined using Temperature Programmed Desorption (TPD) in ultra-high vacuum. LMS-1, LHS-1, and Apollo 14163 released water upon heating, whereas only the Apollo sample directly released measurable quantities of molecular hydrogen. The resulting H2O and H2 TPD curves were fit using a model which considers desorption at the vacuum grain interface, transport in the void space between grain-grain boundaries, molecule formation via recombination reactions and sub-surface diffusion. The model yielded a most probable H2O formation and desorption effective activation energy of ~150 kJ mol-1 for all samples. The probability distribution widths were ~100 - 400, ~100 - 350, and ~100 - 300 kJ mol-1 for LMS-1, LHS-1, and Apollo 14163, respectively. In addition to having the narrowest energy distribution width, the Apollo sample released the least amount to water (103 ppm) relative to LMS-1 (176 ppm) and LHS-1 (195 ppm). Since essentially no molecular hydrogen was observed from the simulants, the results indicate that LMS-1 and LHS-1 display water surface binding and transport interactions similar to actual regolith but not the desorption chemistry associated with the implanted hydrogen from the solar wind. Overall, these terrestrial surrogates are useful for understanding the surface and interface interactions of lunar regolith grains, which are largely dominated by the terminal hydroxyl sites under both solar wind bombardment and terrestrial preparation conditions.
  • No Thumbnail Available
    Item
    Thermal Evolution of Water and Hydrogen from Apollo Lunar Regolith - Data Files
    (Georgia Institute of Technology, 2021) Jones, Brant M. ; Aleksandrov, Aleksandr ; Hibbitts, Charles ; Orlando, Thomas M.
    The evolution of water and molecular hydrogen from Apollo lunar sample 15221, a mature mare soil, was examined by temperature program desorption (TPD) experiments conducted under ultra-high vacuum conditions. Desorption at the grain/vacuum interface with re-adsorption as water transports though the void space of the grains and activated sub-surface diffusion were found to reproduce the experimental TPD signal. Signal from the grain/vacuum interface yielded the second order desorption activation energies and site probability distributions. Water from sample 15221 exhibited a broad distribution of activation energies peaking at 130 kJ mol-1 extending up to 350 kJ mol-1 at zero coverage limit with an onset of 110 kJ mol-1 at full coverage. Our results suggest that water and hydrogen originating from lunar regolith contributes a minor amount to the observed mass in the LCROSS impact event. The abnormal amount of molecular hydrogen observed in the ejecta plume of the LCROSS impact may indicate that the radiolytic production of H2 from electron and galatic cosmic rays of physisorbed water is a contributor to the vast quantity of molecular hydrogen detected.