期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 20, 页码 10245-10251出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp2008094
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资金
- Israel Science Foundation
- James-Franck German-Israeli Program
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- U.S. Department of Energy [DE-AC0500OR22725]
- US DOE-BES [DE-AC02-06CH11357]
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.
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