The first observation of the boson peak from water vapour deposited amorphous ice

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Abstract

We report the observation of the boson peak around 5meV in the inelastic neutron scattering spectrum of a low-density amorphous ice obtained by vapour deposition on a cooled substrate (at 20K) with low flow rate (∼14 mg/h). The integrated intensity of the acoustical peak in the spectrum of the deposited amorphous ice (1-15meV) is noticeably larger compared to that for crystalline ice-Ih (by about 5%). There was no excess scattering in the spectra of other low-density amorphous ices studied before, which were obtained either by annealing the high-density amorphous ice or by hyper-quenching of water droplets of μm size.

Original languageEnglish
Pages (from-to)493-496
Number of pages4
JournalPhysica B: Physics of Condensed Matter
Volume316-317
DOIs
StatePublished - May 2002
Externally publishedYes

Funding

The authors would like to thank J.W. Dreyer for technical assistance during preparation of DEP-ice, and D. Colognesi, M. Bull, C.H. Uffindell and Y. Wang for help during the INS experiments. They would also like to thank EPSRC for financial support and ISIS for provision of neutron beam facilities.

FundersFunder number
ISIS
Engineering and Physical Sciences Research Council

    Keywords

    • Amorphous ice
    • Boson peak
    • Neutron spectroscopy

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