Issue |
Europhys. Lett.
Volume 72, Number 4, November 2005
|
|
---|---|---|
Page(s) | 576 - 582 | |
Section | Condensed matter: structural, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2005-10270-4 | |
Published online | 12 October 2005 |
Incoherent inelastic neutron scattering measurements on ice VII: Are there two kinds of hydrogen bonds in ice?
1
Physique des Milieux Denses, IMPMC, CNRS UMR 7590, Université P&M Curie 4 Place Jussieu, 75252 Paris, France
2
Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck A-6020 Innsbruck, Austria
3
ISIS Facility, Rutherford Appleton Laboratory - Chilton, Didcot OX11 0QX, UK
Received:
19
May
2005
Accepted:
19
September
2005
We report the vibrational spectrum of recovered ice VII measured
by inelastic incoherent neutron scattering and compare this to
similar data of its fully hydrogen-ordered form, ice VIII, under
exactly the same conditions (15, 1
). The spectra of the two
phases have their principal features at similar energies, in both the
translational and librational bands, with a substantial
disorder-related broadening in ice VII. In particular, we find no
evidence for a peak at 49
in ice VII which earlier was
associated with the possible existence of two kinds of hydrogen
bonds. Additional Raman measurements in ice VII and ice VIII show
that the O-H stretching frequencies in the two phases are almost
identical. Therefore, the presence of split molecular-optic bands
in ice phases, including ordinary ice I
, is likely related to
an incomplete description of the phonon dispersion rather than to
a fundamentally new feature in the nature of the hydrogen bond.
PACS: 63.20.-e – Phonons in crystal lattices / 61.12.-q – Neutron diffraction and scattering
© EDP Sciences, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.