Calculation of the Incoherent Scattering Cross Section S_s(k, w) in Non Gaussian Approximation for Classical Liquids

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概要

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• The self correlation function G_s(r, t) and its spacetime transform S_s(k, w) are calculated in the non-Gaussian approximation by using a model for a liquid which molecules move by Langevin diffusion between random finary collisions and also incorporating the solid like oscillatory befaviour into account according to the model of Rehman, Singwi and Sjolander. Similar calculations for G_s(r, t) in the non-Gaussian approximation were previously done by Gibbs and Ferziger. But in their model these authors did not incorporate the oscillatory motion characteristic of liquids. Hence the present model shows an improvement over GF. The non-Gaussian corrections have been estimated for liquid Argon by comparing the best fit of the calculated S_s(k, w) for different values of α/(α+β) with the computer experimental non-Gaussian S_s(k, w) of Nijboer and Rahman at K=2Å^<-1>. Here α and β are the binary collision rate and the Langevin friction coefficients respectively. From the results it appears that in liquid Argon (to the extent that it is described by the present model) the binary collision rate is about four times the Langevin friction coefficient.

• 社団法人日本物理学会の論文
• 1971-08-05

著者

• Chaturvedi D.

  Department Of Physics And Astrophysics Delhi University

• Baijal J.

  Department Of Physics And Astrophysics Delhi University

• Baijal J.

  Department Of Physics And Astrophysics University Of Delhi

• Chaturvedi D.

  Department Of Physics And Astrophysics University Of Delhi

• Baijal J.S.

  Department of Physics and Astrophysics, University of Delhi

関連論文

• Memory Effects and Dynamical Correlations in Liquid Argon
• Calculation of the Incoherent Scattering Cross Section S_s(k, w) in Non Gaussian Approximation for Classical Liquids
• Non-Gauss Effects in Thermal-Neutron Scattering in Liquid Argon

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