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Amorphous solid water: a neutron diffraction study.

J Wenzel, C U Linderstrøm-Lang, S A Rice

    Science (New York, N.Y.)
    |February 7, 1975
    PubMed
    Summary
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    This study reveals amorphous solid D(2)O, or heavy water, exhibits a liquid-like structure. Neutron diffraction confirms tetrahedral coordination and hydrogen bonding, similar to other water forms.

    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Physical Chemistry

    Background:

    • Understanding the structure of amorphous solids is crucial for materials science.
    • Water and its isotopes exist in various condensed phases, each with unique structural properties.
    • Amorphous solid water (ASW) is a relevant phase in astrochemistry and atmospheric science.

    Purpose of the Study:

    • To determine the structure factor of amorphous solid D(2)O (heavy water).
    • To investigate the local atomic arrangement and hydrogen bonding in ASW.
    • To compare the structure of amorphous D(2)O with other condensed phases of water.

    Main Methods:

    • Neutron diffraction was employed to measure the structure factor.
    • Data was collected over a specific range of wave vector transfer (0.8 to 12.3 reciprocal angstroms).

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  • Fourier transformation of the structure factor yielded the pair distribution function.

    • Main Results:

    • The structure factor indicates an amorphous, liquid-like phase.
    • The pair distribution function is consistent with local tetrahedral coordination.
    • Evidence of hydrogen bonding was observed, similar to other water phases.
    • Intramolecular OD separation was determined to be 1.00 angstrom.

    Conclusions:

    • Amorphous solid D(2)O possesses a liquid-like structure.
    • The local structure is characterized by tetrahedral coordination and hydrogen bonding.
    • Neutron diffraction data complements existing X-ray diffraction studies on water structures.