TY - JOUR
T1 - Fast proton hopping detection in ice Ih by quasi-elastic neutron scattering
AU - Presiado, Itay
AU - Lal, Jyotsana
AU - Mamontov, Eugene
AU - Kolesnikov, Alexander I.
AU - Huppert, Dan
PY - 2011/5/26
Y1 - 2011/5/26
N2 - Quasi-elastic neutron scattering was employed on samples of HCldoped polycrystalline ice Ih. The analysis of the scattering signal provides the excess proton hopping time, thop, 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 thop 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.
AB - Quasi-elastic neutron scattering was employed on samples of HCldoped polycrystalline ice Ih. The analysis of the scattering signal provides the excess proton hopping time, thop, 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 thop 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.
UR - https://www.scopus.com/pages/publications/79959952360
U2 - 10.1021/jp2008094
DO - 10.1021/jp2008094
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AN - SCOPUS:79959952360
SN - 1932-7447
VL - 115
SP - 10245
EP - 10251
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 20
ER -