Abstract
Neutron and X-ray structure factor functions of very high-density amorphous (VHDA) ice have been measured and compared with those of the high- and low-density amorphous forms. The principal peak in the VHDA structure factor is sharper than that observed in the HDA ice form. Radial distribution functions (rdfs) indicate the local O...O separation is 2.83 Å, close to 2.85 Å estimated from earlier Raman measurements, but larger than that observed by empirical potential structure refinement simulation of neutron data. Perhaps more importantly the rdfs indicate a greater extent of ordering in VHDA ice, with observable coordination shells extending to at least 20 Å.
| Original language | English |
|---|---|
| Pages (from-to) | 335-339 |
| Number of pages | 5 |
| Journal | Chemical Physics Letters |
| Volume | 397 |
| Issue number | 4-6 |
| DOIs | |
| State | Published - Oct 21 2004 |
| Externally published | Yes |
Funding
This work is supported by the Spallation Neutron Source Project (SNS). SNS is managed by UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 for the US Department of Energy. The US DOE also provided support for measurements at the IPNS and APS Divisions, Argonne National Laboratory under Contract No. W31109ENG 38. In addition the authors acknowledge the help of Mark A. Beno, BESSRC, during the X-ray measurements and the assistance of Jeorg Neuefeind with aspects of the X-ray analysis.
| Funders | Funder number |
|---|---|
| APS Divisions | |
| U.S. Department of Energy | |
| Argonne National Laboratory |