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

Y C Wu1, A Kallis, J Jiang

  • 1Department of Physics, University of Bath, Bath BA2 7AY, United Kingdom.

Physical Review Letters
|September 28, 2010
PubMed
Summary

Variable-energy positron annihilation spectroscopy revealed pore evolution and crystallization in vapor-deposited amorphous solid water films. Crystallization occurred below 140 K, with the top layer transitioning earlier.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Amorphous solid water films are relevant in various scientific fields.
  • Understanding pore evolution and crystallization is crucial for materials characterization.

Purpose of the Study:

  • To investigate the annealing and evolution of pores in vapor-deposited amorphous solid water films.
  • To study the crystallization process of these films using positron annihilation spectroscopy.
  • To determine the temperature ranges for pore evolution and crystallization.

Main Methods:

  • Variable-energy positron annihilation spectroscopy (VEPAS) was employed.
  • Measurements were conducted on vapor-deposited amorphous solid water films.
  • Temperatures ranged from 50 K to 150 K.

Main Results:

  • Positron and positronium annihilation provided insights into grown-in pores and their temperature-dependent evolution.
  • Crystallization of the amorphous solid water films was observed just below 140 K.
  • The topmost 80 nm of the films showed a crystallization transition between 90 K and 100 K.

Conclusions:

  • VEPAS is effective in characterizing pore structures and phase transitions in amorphous solid water.
  • The study confirms crystallization temperatures for amorphous solid water films.
  • Distinct crystallization behaviors were observed in different film regions.