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Title: Electron-Hole Theory of the Effect of Quantum Nuclei on the X-Ray Absorption Spectra of Liquid Water

Journal Article · · Physical Review Letters
 [1];  [2];  [2];  [3];  [4];  [5]
  1. Temple Univ., Philadelphia, PA (United States). Dept. of Physics; DOE/OSTI
  2. Temple Univ., Philadelphia, PA (United States). Dept. of Physics
  3. Temple Univ., Philadelphia, PA (United States). Dept. of Physics. Dept. of Chemistry. Inst. for Computational Molecular Science
  4. Univ. of California, San Diego, CA (United States). Dept. of Chemistry and Biochemistry, Materials Science and Engineering. San Diego Supercomputer Center
  5. Temple Univ., Philadelphia, PA (United States). Dept. of Physics. Inst. for Computational Molecular Science

Electron-hole excitation theory is used to unveil the role of nuclear quantum effects on the x-ray absorption spectral signatures of water, whose structure is computed via path-integral molecular dynamics with the MB-pol intermolecular potential model. Compared to spectra generated from the classically modeled water, quantum nuclei introduce important effects on the spectra in terms of both the energies and line shapes. Fluctuations due to delocalized protons influence the short-range ordering of the hydrogen bond network via changes in the intramolecular covalence, which broaden the preedge spectra. For intermediate-range and long-range ordering, quantum nuclei approach the neighboring oxygen atoms more closely than classical protons, promoting an “icelike” spectral feature with the intensities shifted from the main edge to the postedge. Computed spectra are in nearly quantitative agreement with the available experimental data.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Complex Materials from First Principles (CCM); Temple Univ., Philadelphia, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; SC0012575
OSTI ID:
1541369
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 121; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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