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In-situ NMR spin-lattice relaxation measurements were performed on severalvapor deposited ices. The measurements, which span more than 6 orders ofmagnitude in relaxation times, show a complex spin-lattice relaxation patternthat is strongly dependent on the growth conditions of the sample. Therelaxation patterns change from multi-timescale relaxation for samples grown attemperatures below the amorphous-crystalline transition temperature to singleexponential recovery for samples grown above the transition temperature. Theslow-relaxation contribution seen in cold-grown samples exhibits a temperaturedependence, and becomes even slower after the sample is annealed at 200K. Thefast-relaxation contribution seen in these samples, does not seem to change ordisappear even when heating to temperatures where the sample is evaporated. Thepossibility that the fast relaxation component is linked to the microporousstructures in amorphous ice samples is further examined using an environmentalelectron scanning microscope. The images reveal complex meso-scale microporousstructures which maintain their morphology up to their desorption temperatures.These findings, support the possibility that water molecules at pore surfacesmight be responsible for the fast-relaxation contribution. Furthermore, theresults of this study indicate that the pore-collapse dynamics observed in thepast in amorphous ices using other experimental techniques, might beeffectively inhibited in samples which are grown by relatively fast vapordeposition.

In-situ NMR Measurements of Vapor Deposited Ice