Person:
Orlando,
Thomas M.
Orlando,
Thomas M.
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ItemInvestigation of Water Interactions With Apollo Lunar Regolith Grains - Data Files(Georgia Institute of Technology, 2019) Jones, Brant M. ; Aleksandrov, Aleksandr ; Dyar, M. Darby ; Hibbitts, Charles ; Orlando, Thomas M.Desorption activation energies of chemisorbed water on Apollo lunar samples 14163 and 10084 were determined by temperature program desorption (TPD) experiments conducted under ultra-high vacuum conditions. Desorption at the grain/vacuum interface and desorption/transport of water though the porous medium with re-adsorption 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. 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 photostimulated desorption is neglected.
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ItemEnergetic processing and stimulated chemistry of pre-cometary ices and the primordial surfaces of comet nuclei(Georgia Institute of Technology, 2010-09-03) Orlando, Thomas M. ; Grieves, Gregory A.
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ItemNon-thermal production of atomic and molecular oxygen and hydrogen in Saturn's ring atmosphere(Georgia Institute of Technology, 2010-01-31) Orlando, Thomas M.