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Title: Temperature-Independent Nuclear Quantum Effects on the Structure of Water

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [4];  [5];  [1];  [1]
  1. Stockholm Univ., Stockholm (Sweden)
  2. KTH Royal Institute of Technology, Stockholm (Sweden)
  3. Japan Synchrotron Radiation Research Institute, Hyogo (Japan)
  4. The Univ. of Tokyo, Chiba (Japan)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)

Nuclear quantum effects (NQEs) have a significant influence on the hydrogen bonds in water and aqueous solutions and have thus been the topic of extensive studies. However, the microscopic origin and the corresponding temperature dependence of NQEs have been elusive and still remain the subject of ongoing discussion. Previous x-ray scattering investigations indicate that NQEs on the structure of water exhibit significant temperature dependence. Here, by performing wide-angle x-ray scattering of H2O and D2O droplets at temperatures from 275 K down to 240 K, we determine the temperature dependence of NQEs on the structure of water down to the deeply supercooled regime. The data reveal that the magnitude of NQEs on the structure of water is temperature independent, as the structure factor of D2O is similar to H2O if the temperature is shifted by a constant 5 K, valid from ambient conditions to the deeply supercooled regime. Analysis of the accelerated growth of tetrahedral structures in supercooled H2O and D2O also shows similar behavior with a clear 5 K shift. The results indicate a constant compensation between NQEs delocalizing the proton in the librational motion away from the bond and in the OH stretch vibrational modes along the bond. In conclusion, this is consistent with the fact that only the vibrational ground state is populated at ambient and supercooled conditions.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; 667205; 2013-8823; 2016B8055
OSTI ID:
1390302
Journal Information:
Physical Review Letters, Vol. 119, Issue 7; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (8)

Coherent X-rays reveal the influence of cage effects on ultrafast water dynamics journal May 2018
Observation of the thermal influenced quantum behaviour of water near a solid interface journal May 2018
Nuclear quantum effects on the liquid–liquid phase transition of a water-like monatomic liquid journal January 2018
Using a monomer potential energy surface to perform approximate path integral molecular dynamics simulation of ab initio water at near-zero added cost journal January 2019
Temperature-dependent vibrational spectra and structure of liquid water from classical and quantum simulations with the MB-pol potential energy function journal December 2017
Maxima in the thermodynamic response and correlation functions of deeply supercooled water journal December 2017
Coherent X-rays reveal the influence of cage effects on ultrafast water dynamics text January 2018
Using a monomer potential energy surface to perform approximate path integral molecular dynamics simulation of ab-initio water with near-zero added cost text January 2018

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