It is demonstrated that the width of the uncorrelated atomic-charge distribution in glasses can be extracted from the frequency dependence of the coupling coefficient for the far-infrared absorption measured experimentally by the time-domain terahertz spectroscopy technique. This value for As2S3 glass is found to be 0.12 (e). A density functional theory-based tight-binding molecular dynamics model of As2S3 glass qualitatively supports these findings.
@article{arxiv.0708.3982,
title = {Atomic-charge distribution in glasses by terahertz spectroscopy},
author = {S. N. Taraskin and S. I. Simdyankin and S. R. Elliott},
journal= {arXiv preprint arXiv:0708.3982},
year = {2009}
}