Structural and phase changes in amorphous solid water films revealed by positron beam spectroscopy.
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.
Wu
Y C
YC
Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom.
Kallis
A
A
Jiang
J
J
Coleman
P G
PG