Physical Review Letters · 2010 · 12 citations · 20 references
Amorphous Solid WaterEngineeringNanoporous MaterialChemistryPositron Beam SpectroscopyOptical PropertiesPhase ChangesPositronium AnnihilationThin Film ProcessingMaterials ScienceMaterials EngineeringTopmost 80Material AnalysisSurface ScienceCondensed Matter PhysicsApplied PhysicsPorosityThin FilmsAmorphous Solid
The evolution and annealing of pores in, and the crystallization of, vapor-deposited films of amorphous solid water have been studied by using variable-energy positron annihilation spectroscopy for temperatures in the range 50-150 K. Both positron and positronium annihilation provide insight to the nature of the grown-in pores and their evolution with temperature. Crystallization of the films was observed at just below 140 K, in agreement with earlier studies, with the topmost 80 nm undergoing a transition consistent with crystallization at 90-100 K.
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Structural Transitions in Amorphous Water Ice and Astrophysical Implications
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