title: Structure of high-density amorphous ice under pressure.
abstract: We report in situ neutron diffraction studies of high-density amorphous ice (HDA) at 100 K at pressures up to 2.2 GPa. We find that the compression is achieved by a strong contraction ( approximately 20%) of the second neighbor coordination shell, so that at 2.2 GPa it closely approaches the first coordination shell, which itself remains intact in both structure and size. The hydrogen bond orientations suggest an absence of hydrogen bonding between first and second shells and that HDA has increasingly interpenetrating hydrogen bond networks under pressure.
authors.affiliation: Physique des Milieux Condensés, UMR 7602, Université P.M. Curie, B77, 4 Place Jussieu, 75252 Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Klotz
authors.forename: G
authors.initials: G
authors.lastname: Hamel
authors.forename: J S
authors.initials: JS
authors.lastname: Loveday
authors.forename: R J
authors.initials: RJ
authors.lastname: Nelmes
authors.forename: M
authors.initials: M
authors.lastname: Guthrie
authors.forename: A K
authors.initials: AK
authors.lastname: Soper