Nuclear and Atomic Physics

    

Comparison of Voigt Profile Fitting Using Origin and Algebraic Approximation in Extracting Lorentzian Broadening for Electron Density Diagnostics

Authors: Zi-Jing Chiah, Elton Song-Zhe Mah

Accurate extraction of Lorentzian broadening from optical emission spectra is essential for estimating electron density in plasmas via Stark broadening. In this study, we compare two commonly used methods: (1) direct Voigt profile fitting using Origin, and (2) manual calculation using approximation of = . It is found that the Lorentzian width obtained from the approximation can differ by 3—5% compared to direct fitting, resulting in a corresponding deviation in the estimated electron density. Direct fitting does not need manual calculation and delivers more accurate results, making it the preferred method.

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[v1] 2025-08-05 19:35:19

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