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

Journal Article · Sat Jan 01 00:00:00 EST 2011 · Journal of Physical Chemistry C

DOI:https://doi.org/10.1021/jp2008094· OSTI ID:1020799

Presiado, Itay ^[1]; Lal, Jyotsana ^[1]; Mamontov, Eugene ^[1]; Kolesnikov, Alexander I ^[1]; Huppert, Dan I ^[1]

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1. ORNL

Quasi-elastic neutron scattering was employed on samples of HCl-doped polycrystalline ice I{sub h}. The analysis of the scattering signal provides the excess proton hopping time, {tau}{sub 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}{sub 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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1020799
• Journal Information: Journal of Physical Chemistry C, Vol. 115, Issue 20; ISSN 1932--7447
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACTIVATION ENERGY
DETECTION
NEUTRONS
PROTONS
SCATTERING
WATER