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Publication Detail
Relaxation effects in low density amorphous ice: Two distinct structural states observed by neutron diffraction
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Winkel K, Bowron DT, Loerting T, Mayer E, Finney JL
  • Publisher:
    AMER INST PHYSICS
  • Publication date:
    28/05/2009
  • Journal:
    J CHEM PHYS
  • Volume:
    130
  • Issue:
    20
  • Print ISSN:
    0021-9606
  • Language:
    EN
  • Keywords:
    amorphous state, deuterium compounds, hydrogen bonds, ice, neutron diffraction, TRANSITION, LIQUID, WATER, PRESSURE, FORMS
  • Addresses:
    Winkel, K
    Univ Innsbruck
    Inst Gen Inorgan & Theoret Chem
    A-6020
    Innsbruck
    Austria
Abstract
Neutron diffraction with H/D isotopic substitution is used to investigate the structure of low density amorphous ice produced from (1) high density amorphous ice by isobaric warming and (2) very high density amorphous ice by isothermal decompression. Differences are found in the scattering patterns of the two low density amorphous ices that correlate with structural perturbations on intermediate length scales in the hydrogen bonded water network. Atomistic modeling suggests that the structural states of the two samples may relate to a competition between short range and intermediate range order and disorder. This structural difference in two low density amorphous (LDA) ices is also evident when comparing their compression behavior. In terms of the energy landscape formalism this finding implies that we have produced and characterized the structural difference of two different basins within the LDA-megabasin corresponding to identical macroscopic densities.
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