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Spectrum of the velocity autocorrelation function of a molecule in a liquid

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Abstract

The theory of the autocorrelation function ϕV(t) of the velocity of an isolated molecule is formulated, taking into account the contributions of longitudinal and transverse modes of motion. The spectral density function\(\widetilde\varphi _V (\omega )\) of ϕV(t) accordingly, turns out to be expressed in terms of two independent susceptibilities, one of the relaxation type and the other of the wave type. The simple dispersion model\(\widetilde\varphi _V (\omega )\) constructed on the basis of the theory developed in the article agrees very precisely with the data of a computer “experiment” for liquid argon over the entire range of variation ofω.

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Authors and Affiliations

  1. I. I. Mechnikov Odessa State University, USSR

    S. B. Pelishenko & I. Z. Fisher

Authors
  1. S. B. Pelishenko
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  2. I. Z. Fisher
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 27–32, August, 1978.

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Pelishenko, S.B., Fisher, I.Z. Spectrum of the velocity autocorrelation function of a molecule in a liquid. Soviet Physics Journal 21, 1000–1005 (1978). https://doi.org/10.1007/BF00892351

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  • DOI: https://doi.org/10.1007/BF00892351

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