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The atomic charge distribution in glasses obtained by terahertz spectroscopy

S N Taraskin1,2, S I Simdyankin2 and S R Elliott2

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It is demonstrated that the width of the uncorrelated atomic charge distribution can be extracted from the frequency dependence of the coupling coefficient for far-infrared absorption measured experimentally by a 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.


PACS

78.30.Ly Disordered solids

61.43.Fs Glasses

78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)

61.43.Bn Structural modeling: serial-addition models, computer simulation

78.70.Gq Microwave and radio-frequency interactions

Subjects

Condensed matter: electrical, magnetic and optical

Condensed matter: structural, mechanical & thermal

Dates

Issue 45 (14 November 2007)

Received 18 August 2007

Published 24 October 2007



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