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Structures of high and low density amorphous ice by neutron diffraction

Finney, JL; Hallbrucker, A; Kohl, I; Soper, AK; Bowron, DT; (2002) Structures of high and low density amorphous ice by neutron diffraction. PHYS REV LETT , 88 (22) , Article 225503. 10.1103/PhysRevLett.88.225503. Green open access

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Abstract

Neutron diffraction with isotope substitution is used to determine the structures of high (HDA) and low (LDA) density amorphous ice. Both "phases" are fully hydrogen bonded, tetrahedral networks, with local order similarities between LDA and ice Ih , and HDA and liquid water. Moving from HDA, through liquid water and LDA to ice Ih , the second shell radial order increases at the expense of spatial order. This is linked to a fifth first neighbor "interstitial" that restricts the orientations of first shell waters. This "lynch pin" molecule which keeps the HDA structure intact has implications for the nature of the HDA-LDA transition that bear on the current metastable water debate.

Type: Article
Title: Structures of high and low density amorphous ice by neutron diffraction
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.88.225503
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.88.225503
Language: English
Keywords: PRESSURE-INDUCED AMORPHIZATION, SUPERCOOLED WATER, TERTIARY BUTANOL, LIQUID WATER, GLASSY WATER, X-RAY, SCATTERING, BEHAVIOR
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/136586
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