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Title: Comment on “Boson Peak in Deeply Cooled Confined Water: A Possible Way to Explore the Existence of the Liquid-to-Liquid Transition in Water”

Abstract

In their Letter, Wang et al. report on an inelastic neutron scattering (INS) experiment where they describe the pressure evolution of a low energy (E ~ 6 meV) excitation, emerging in confined protonated water only below 230 K at an exchanged momentum Q=2.0 Å-1. Also, water confinement was used to overcome the unavoidable crystallization occurring below ~250 K in bulk water. The authors report that a similar finding was also obtained in both bulk (numerical simulations) and confined water at ambient pressure. They refer to this low temperature excitation as a boson peak (BP), and relate its occurrence to the Widom line, concluding that the observed pressure behavior of the BP reveals the signature of the high-density liquid (HDL) to the low-density liquid (LDL) transition proposed, though severely questioned, for bulk water. Lastly, we believe these claims to be unconvincing for the following reasons.

Authors:
 [1];  [2]
  1. Consiglio Nazionale delle Ricerche Istituto Officina dei Materiali, Operative Group in Grenoble (OGG) c/o Institut Laue Langevin (France)
  2. Centre for Life Nano Science IIT at Sapienza Istituto Italiano di Tecnologia, Roma (Italy)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1356955
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 115; Journal Issue: 14; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Formisano, F., and De Panfilis, S.. Comment on “Boson Peak in Deeply Cooled Confined Water: A Possible Way to Explore the Existence of the Liquid-to-Liquid Transition in Water”. United States: N. p., 2015. Web. doi:10.1103/PhysRevLett.115.149801.
Formisano, F., & De Panfilis, S.. Comment on “Boson Peak in Deeply Cooled Confined Water: A Possible Way to Explore the Existence of the Liquid-to-Liquid Transition in Water”. United States. https://doi.org/10.1103/PhysRevLett.115.149801
Formisano, F., and De Panfilis, S.. 2015. "Comment on “Boson Peak in Deeply Cooled Confined Water: A Possible Way to Explore the Existence of the Liquid-to-Liquid Transition in Water”". United States. https://doi.org/10.1103/PhysRevLett.115.149801.
@article{osti_1356955,
title = {Comment on “Boson Peak in Deeply Cooled Confined Water: A Possible Way to Explore the Existence of the Liquid-to-Liquid Transition in Water”},
author = {Formisano, F. and De Panfilis, S.},
abstractNote = {In their Letter, Wang et al. report on an inelastic neutron scattering (INS) experiment where they describe the pressure evolution of a low energy (E ~ 6 meV) excitation, emerging in confined protonated water only below 230 K at an exchanged momentum Q=2.0 Å-1. Also, water confinement was used to overcome the unavoidable crystallization occurring below ~250 K in bulk water. The authors report that a similar finding was also obtained in both bulk (numerical simulations) and confined water at ambient pressure. They refer to this low temperature excitation as a boson peak (BP), and relate its occurrence to the Widom line, concluding that the observed pressure behavior of the BP reveals the signature of the high-density liquid (HDL) to the low-density liquid (LDL) transition proposed, though severely questioned, for bulk water. Lastly, we believe these claims to be unconvincing for the following reasons.},
doi = {10.1103/PhysRevLett.115.149801},
url = {https://www.osti.gov/biblio/1356955}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 14,
volume = 115,
place = {United States},
year = {2015},
month = {9}
}

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