Roles of quantum nuclei and inhomogeneous screening in the x-ray absorption spectra of water and ice

Lingzhu Kong, Xifan Wu, Roberto Car

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50 Scopus citations

Abstract

We calculate the x-ray absorption spectra of liquid water under ambient conditions and of hexagonal ice close to melting, using a static GW approach that includes approximately inhomogeneous screening effects. Quantum dynamics of the nuclei is taken into account by averaging the absorption cross section over molecular configurations generated by path integral simulations. We find that the inclusion of quantum disorder is essential to bring the calculated spectra in close agreement with experiment. In particular, the intensity of the pre-edge feature, a spectral signature of broken and distorted hydrogen bonds, is accurately reproduced, in water and ice, only when quantum nuclei are considered. The effect of the inhomogeneous screening is less important but non-negligible, particularly in ice.

Original languageEnglish (US)
Article number134203
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number13
DOIs
StatePublished - Oct 8 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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