Frequency domain description of Kohlrausch response through a pair of Havriliak-Negami-type functions: An analysis of functional proximity

J. S. Medina, R. Prosmiti, P. Villarreal, G. Delgado-Barrio, and J. V. Alemán
Phys. Rev. E 84, 066703 – Published 16 December 2011

Abstract

An approximation to the Fourier transform (FT) of the Kohlrausch function (stretched exponential) with shape parameter 0<β1 is presented by using Havriliak-Negami-like functions. Mathematical expressions to fit their parameters α, γ, and τ, as functions of β (0<β1 and 1<β<2) are given, which allows a quick identification in the frequency domain of the corresponding shape factor β. Reconstruction via fast Fourier transform of frequency approximants to time domain are shown as good substitutes in short times though biased in long ones (increasing discrepancies as β1). The method is proposed as a template to commute time and frequency domains when analyzing complex data. Such a strategy facilitates intensive algorithmic search of parameters while adjusting the data of one or several Kohlrausch-Williams-Watts relaxations.

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  • Received 4 July 2011

DOI:https://doi.org/10.1103/PhysRevE.84.066703

©2011 American Physical Society

Authors & Affiliations

J. S. Medina1,*, R. Prosmiti1, P. Villarreal1, G. Delgado-Barrio1, and J. V. Alemán2

  • 1Instituto de Física Fundamental, IFF-CSIC, Serrano 123, Madrid ES-28006, Spain
  • 2Departamento Química, Facultad de Ciencias del Mar, ULPGC, Campus Universitario de Tafira, Las Palmas de G. Canaria ES-35017, Spain

  • *tlazcala@yahoo.es

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Vol. 84, Iss. 6 — December 2011

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