Journal
CHEMICAL PHYSICS
Volume 427, Issue -, Pages 111-116Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2013.09.010
Keywords
Nuclear quantum effects; Zero point kinetic energy; Hydrogen bond; Proton potential; Inelastic neutron scattering
Funding
- CNR-STFC [06/20018]
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By means of Deep Inelastic Neutron Scattering we determined the temperature dependence of the proton kinetic energy in polycrystalline ice Ih between 5 K and 271 K. We compare our results with predictions form Path Integral quantum simulations and semiclassical quasi-harmonic models with phase-dependent frequencies. The latter show the best agreement with the experiment if the librational contribution is properly taken into account. The kinetic energy increase with temperature in ice is also found to be approximately a factor similar to 5 smaller than in the case of liquid water above room temperature, highlighting the role played by anharmonic quantum fluctuations in the two phases. (C) 2013 Elsevier B. V. All rights reserved.
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