Structural Studies of Molecular Ices at High Pressure.

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  • Loveday J. S.
    Department of Physics and Astronomy, The University of Edinburgh
  • Nelmes R. J.
    Department of Physics and Astronomy, The University of Edinburgh
  • Marshall W. G.
    Department of Physics and Astronomy, The University of Edinburgh
  • Besson J. M.
    Physique des Milieux Condensés, Université P. et M. Curie
  • Klotz S.
    Physique des Milieux Condensés, Université P. et M. Curie
  • Hamel G.
    Département des Hautes Pressions, Université P. et M. Curie
  • Belmonte S. A.
    Département des Hautes Pressions, Université P. et M. Curie

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  • Structural Studies of Molecular Ices at

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Abstract

Recent developments in high-pressure diffraction techniques using both neutron and synchrotron x-ray sources now allow accurate studies of ices over a wide range of pressures. Results are revealing complex and unexpected behaviour. The disorder in ice VII is found to be different from that previously thought and to give rise to a complex Hbond geometry. The ammonia molecules in ammonia phase IV are found to orientationally ordered with a bifurcated H-bond geometry which becomes more distorted with increasing pressure. And hydrogen sulphide phase-I' is found to have a partially ordered structure where H-bonding plays a more significant role than at ambient pressure.

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