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    Researchers studied ice crystals from Lake Vostok using X-ray scattering. They found the scattering was primarily inelastic, providing new insights into ice structure and disorder.

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    Area of Science:

    • * Solid-state physics
    • * Glaciology
    • * Materials science

    Background:

    • * Subglacial ice offers unique insights into Earth's history and material properties under extreme conditions.
    • * Lake Vostok ice provides a pristine sample of ancient ice.
    • * Understanding ice crystal structure is crucial for various scientific disciplines.

    Purpose of the Study:

    • * To investigate the structural and dynamic properties of ice Ih single crystals from Lake Vostok.
    • * To analyze diffuse X-ray scattering data to understand the nature of scattering.
    • * To re-evaluate existing neutron scattering data on heavy ice.

    Main Methods:

    • * Diffuse X-ray scattering (DXS)
    • * Inelastic X-ray scattering (IXS)
    • * Ab initio calculations
    • * Monte Carlo modeling

    Main Results:

    • * Diffuse scattering from Lake Vostok ice crystals was identified as predominantly inelastic.
    • * Ab initio calculations supported the interpretation of scattering within the framework of an ordered ice XI approximant.
    • * Combined with Monte Carlo simulations, the data allowed for a revised interpretation of previous heavy ice neutron scattering data.

    Conclusions:

    • * The study clarifies the nature of diffuse scattering in subglacial ice crystals.
    • * It provides a more accurate model for understanding thermal diffuse scattering and static disorder in ice.
    • * The findings contribute to a better comprehension of ice physics and its historical record.