Quantum Tunneling of Water in Beryl: A New State of the Water Molecule

Alexander I. Kolesnikov, George F. Reiter, Narayani Choudhury, Timothy R. Prisk, Eugene Mamontov, Andrey Podlesnyak, George Ehlers, Andrew G. Seel, David J. Wesolowski, Lawrence M. Anovitz

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Abstract

Using neutron scattering and ab initio simulations, we document the discovery of a new "quantum tunneling state" of the water molecule confined in 5 Å channels in the mineral beryl, characterized by extended proton and electron delocalization. We observed a number of peaks in the inelastic neutron scattering spectra that were uniquely assigned to water quantum tunneling. In addition, the water proton momentum distribution was measured with deep inelastic neutron scattering, which directly revealed coherent delocalization of the protons in the ground state.

Original languageEnglish
Article number167802
JournalPhysical Review Letters
Volume116
Issue number16
DOIs
StatePublished - Apr 22 2016

Funding

This material is primarily based upon work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division. The neutron scattering experiments at Oak Ridge National Laboratorys Spallation Neutron Source were sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. The STFC Rutherford Appleton Laboratory is thanked for access to neutron beam facilities. Some of the beryl crystals used in our experiments were cut by Bradley S.AWilson of Coast-to-Coast Rarestones, International. N.C. also gratefully acknowledges research support from the University of Washington (DOE/UW Grants No.4000127504, No.6400012674; No.66-1283).

FundersFunder number
Scientific User Facilities Division
U.S. Department of Energy
Office of Science
Basic Energy Sciences
University of Washington4000127504, 6400012674
Chemical Sciences, Geosciences, and Biosciences Division

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