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Local random structure of supercritical carbon dioxide

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Abstract

Data on coherent anti-Stokes Raman scattering (CARS) spectroscopy of supercritical CO2 are analyzed by methods of statistical theory. The following is shown. The random local structure of supercritical CO2 is laminated at the critical density and a temperature of 33°C. The layer thickness is no more than 8 nm. The average layer density exceeds the critical density by 1%. The fraction of local layers rarefied by density fluctuations exceeds the fraction of layers compacted by fluctuations by 8%. The characteristic quantity of the local fluctuation of the density is 8% of the critical value of the density. The lifetime of local fluctuations of the density is ∼10−10 s.

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Authors and Affiliations

  1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia

    Yu. A. Chaikina

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  1. Yu. A. Chaikina
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Correspondence to Yu. A. Chaikina.

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Original Russian Text © Yu.A. Chaikina, 2013, published in Sverkhkriticheskie Flyuidy: Teoriya i Praktika, 2013, Vol. 8, No. 4, pp. 15–28.

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Chaikina, Y.A. Local random structure of supercritical carbon dioxide. Russ. J. Phys. Chem. B 8, 1025–1032 (2014). https://doi.org/10.1134/S1990793114080041

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  • DOI: https://doi.org/10.1134/S1990793114080041

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