A program for the fitting of up to three Havriliak-Negami dispersions to dielectric data

Constantino Grosse

doi:10.1016/j.jcis.2021.05.010

A program for the fitting of up to three Havriliak-Negami dispersions to dielectric data

J Colloid Interface Sci. 2021 Oct 15:600:318-323. doi: 10.1016/j.jcis.2021.05.010. Epub 2021 May 6.

Author

Constantino Grosse¹

Affiliation

¹ Departamento de Física, Universidad Nacional de Tucumán, Avenida Independencia 1800, 4000 San Miguel de Tucumán, Argentina. Electronic address: cgrosse@herrera.unt.edu.ar.

PMID: 34022728
DOI: 10.1016/j.jcis.2021.05.010

Abstract

A new version of the DielParamFit program [J. Colloid Interface Sci. 419 (2014) 102-106] for the fitting of a superposition of dispersion terms to measured dielectric data is presented. It extends its applicability to a wide range of new systems by allowing the use of up to three Havriliak-Negami dispersions, each of which can be readily transformed into Debye, Cole-Cole, or Cole-Davidson terms. Moreover, it greatly enhances its usability by means of a graphic interface that displays the measured data together with the model spectra allowing to iteratively adjust the chosen terms and guess parameter values guided by a live view of the obtained results. The DielParamFit_2 program executable file for Microsoft Windows is available upon request from the author.

Keywords: Cole-Cole; Cole-Davidson; Debye; DielParamFit; Dielectric dispersion; Havriliak-Negami; Levenberg-Marquardt algorithm; Non linear parameter fitting.