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Title: Anomalously large isotope effect in the glass transition of water

Here we present the discovery of an unusually large isotope effect in the structural relaxation and the glass transition temperature T g of water. Dielectric relaxation spectroscopy of low-density as well as of vapor deposited amorphous water reveal T g differences of 10±2K between H 2O and D 2O, sharply contrasting with other hydrogen bonded liquids for which H/D exchange increases T g by typically less than 1K. We show that the large isotope effect and the unusual variation of relaxation times in water at low temperatures can be explained in terms of quantum effects. Thus, our findings shed new light on water's peculiar low-temperature dynamics and the possible role of quantum effects in its structural relaxation, and possibly in dynamics of other low molecular weight liquids.
 [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [1] ;  [4] ;  [2] ;  [5] ;  [1] ;  [3] ;  [2]
  1. Dortmund Univ. of Technology (Germany). Dept. of Physics
  2. Univ. of Tennessee, Knoxville, TN (United States). Joint Inst. for Neutron Sciences, Dept. of Chemistry; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Science Division
  3. Univ. of Innsbruck, Innsbruck (Austria). Inst. of Physical Chemistry
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  5. Arizona State Univ., Tempe, AZ (United States). Dept. of Chemistry and Biochemistry
Publication Date:
Grant/Contract Number:
AC05-00OR22725; CHE-1213444; CHE-1026124; BO1301
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 111; Journal Issue: 49; Journal ID: ISSN 0027-8424
National Academy of Sciences, Washington, DC (United States)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; dynamics of water; isotope effect; quantum effects; glass transition; amorphous ice
OSTI Identifier: