title: Anomalously large isotope effect in the glass transition of water.
abstract: We present the discovery of an unusually large isotope effect in the structural relaxation and the glass transition temperature Tg of water. Dielectric relaxation spectroscopy of low-density as well as of vapor-deposited amorphous water reveal Tg differences of 10 ± 2 K between H2O and D2O, sharply contrasting with other hydrogen-bonded liquids for which H/D exchange increases Tg by typically less than 1 K. 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.
authors.affiliation: Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany;
authors.forename: Catalin
authors.initials: C
authors.lastname: Gainaru
authors.affiliation: Department of Chemistry and Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, TN 37996; Chemical Sciences Division and.
authors.forename: Alexander L
authors.initials: AL
authors.lastname: Agapov
authors.affiliation: Institute of Physical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria; and.
authors.forename: Violeta
authors.initials: V
authors.lastname: Fuentes-Landete
authors.affiliation: Institute of Physical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria; and.
authors.forename: Katrin
authors.initials: K
authors.lastname: Amann-Winkel
authors.affiliation: Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany;
authors.forename: Helge
authors.initials: H
authors.lastname: Nelson
authors.affiliation: Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany;
authors.forename: Karsten W
authors.initials: KW
authors.lastname: Köster
authors.affiliation: Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831;
authors.forename: Alexander I
authors.initials: AI
authors.lastname: Kolesnikov
authors.affiliation: Department of Chemistry and Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, TN 37996; Chemical Sciences Division and.
authors.forename: Vladimir N
authors.initials: VN
authors.lastname: Novikov
authors.affiliation: Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287.
authors.forename: Ranko
authors.initials: R
authors.lastname: Richert
authors.affiliation: Fakultät Physik, Technische Universität Dortmund, D-44221 Dortmund, Germany;
authors.forename: Roland
authors.initials: R
authors.lastname: Böhmer
authors.affiliation: Institute of Physical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria; and.
authors.forename: Thomas
authors.initials: T
authors.lastname: Loerting
authors.affiliation: Department of Chemistry and Joint Institute for Neutron Sciences, University of Tennessee, Knoxville, TN 37996; Chemical Sciences Division and sokolov@utk.edu.
authors.forename: Alexei P
authors.initials: AP
authors.lastname: Sokolov
keywords: amorphous ice; dynamics of water; glass transition; isotope effect; quantum effects