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 language | English |
|---|---|
| Pages (from-to) | 493-496 |
| Number of pages | 4 |
| Journal | Physica B: Physics of Condensed Matter |
| Volume | 316-317 |
| DOIs | |
| State | Published - May 2002 |
| Externally published | Yes |
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.
| Funders | Funder number |
|---|---|
| ISIS | |
| Engineering and Physical Sciences Research Council |
Keywords
- Amorphous ice
- Boson peak
- Neutron spectroscopy