Fast Proton Hopping Detection in Ice Ih by Quasi-Elastic Neutron Scattering

被引：37

作者：

Presiado, Itay ^{[1
]}

Lal, Jyotsana ^{[2
]}

Mamontov, Eugene ^{[3
]}

Kolesnikov, Alexander I. ^{[3
]}

Huppert, Dan ^{[1
]}

机构：

[1] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Chem, IL-69978 Tel Aviv, Israel

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[3] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2011年 / 115卷 / 20期

基金：

以色列科学基金会;

关键词：

DOPED ICE; HYDROCHLORIC-ACID; ISOTOPIC EXCHANGE; ELEMENTARY STEPS; LIQUID WATER; DIFFUSION; DYNAMICS; CONDUCTIVITY; MECHANISM; MOBILITY;

D O I：

10.1021/jp2008094

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Quasi-elastic neutron scattering was employed on samples of HCl-doped polycrystalline ice I-h. The analysis of the scattering signal provides the excess proton hopping time, tau(hop), in the temperature range of 140-195 K. The hopping time strongly depends on the temperature of the sample, and the activation energy of a hopping step is 17 kJ/mol. The values of tau(hop) of the current experiment are in good agreement with calculated values derived from previous photochemical experiments,(1) in which we found that the proton hopping time at T > 242 K is on the order of 200 fs, roughly 10 times shorter than in liquid water at room temperature.

引用

页码：10245 / 10251

页数：7

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