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Far-Infrared Spectral Studies of Phase Changes in Water Ice Induced by Proton Irradiation

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Abstract

Changes in the FIR spectrum of crystalline and amorphous water ice as a function of temperature are reported. The dramatic differences between the spectra of these ices in the FIR are used to examine the effect of proton irradiation on the stability of the crystalline and amorphous ice phases from 13 to 77 K. In particular, the spectra near 13 K show interconversion between the amorphous and crystalline ice phases beginning at doses near 2 eV/molecule and continuing cyclically with increased dose. The results are used to estimate the stability of irradiated ices in astronomical environments.


Publication:

The Astrophysical Journal

Pub Date:
December 1992
DOI:

10.1086/172065

Bibcode:
1992ApJ...401..353M
Keywords:
  • Comets;
  • Far Infrared Radiation;
  • Ice;
  • Infrared Spectra;
  • Interstellar Matter;
  • Proton Irradiation;
  • Amorphous Materials;
  • Cosmochemistry;
  • Cryogenic Temperature;
  • Crystal Structure;
  • Phase Transformations;
  • Water;
  • Astrophysics;
  • ISM: DUST;
  • EXTINCTION;
  • MOLECULAR DATA