Structural and phase changes in amorphous solid water films revealed by positron beam spectroscopy

Reference:

Wu, Y. C., Kallis, A., Jiang, J. and Coleman, P. G., 2010. Structural and phase changes in amorphous solid water films revealed by positron beam spectroscopy. Physical Review Letters, 105 (6), 066103.

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Official URL:

http://dx.doi.org/10.1103/PhysRevLett.105.066103

Abstract

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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