Abstract
We have studied the elastic properties of thin films of amorphous water (a-H2O), prepared at 4.4 K by quench condensation. At low temperatures acoustic anomalies are observed, which are characteristic for amorphous solids. Annealing, even at moderate temperatures, reduces the number of tunneling states. A strong increase of the acoustic absorption is observed in the vicinity of the annealing temperatures. This indicates that structural rearrangements are possible in quenched condensed films at temperatures well below the glass transition.
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