Origin of low-frequency local vibrational modes in high density amorphous ice

被引：36

作者：

Tse, JS

Klug, DD

Tulk, CA

Svensson, EC

Swainson, I

Shpakov, VP

Belosludov, VR

机构：

[1] Natl Res Council Canada, Steacie Inst Mol Sci, Ottawa, ON K1A 0R6, Canada

[2] Russian Acad Sci, Inst Inorgan Chem, Siberian Branch, Novosibirsk 630090, Russia

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 85卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.85.3185

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Incoherent-inelastic neutron scattering data are obtained from 5-80 K for high-density amorphous (hda) ice in the region 0-135 cm(-1). An excess contribution to the vibrational density of states is identified near 20 cm(-1). The origin of these vibrations has been identified by lattice dynamics calculations on an "experimental" structure derived from reverse Monte Carlo analysis of hda ice neutron diffraction: data. An interpretation that localized oscillations of short chains and isolated water molecules are responsible for the excess low-frequency modes is consistent with our data.

引用

页码：3185 / 3188

页数：4

共 25 条

[1] Absence of an isotope effect in the two level spectrum of amorphous ice [J].