Roles of quantum nuclei and inhomogeneous screening in the x-ray absorption spectra of water and ice
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Journal ArticleDate
2012-10-08Author
Kong, LWu, X
Car, R
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http://hdl.handle.net/20.500.12613/5987
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10.1103/PhysRevB.86.134203Abstract
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. © 2012 American Physical Society.Citation to related work
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Physical Review B - Condensed Matter and Materials PhysicsADA compliance
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http://dx.doi.org/10.34944/dspace/5969