Determination of excitation temperature in laser-induced plasmas using columnar density Saha-Boltzmann plot

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ID: 2820
2019
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Abstract
In exploiting the analytical capabilities of plasma-based spectroscopy method, the evaluation of plasma parameters, particularly the plasma temperature, is a crucial step. In this work, a modified Saha-Boltzmann plot, which uses the columnar densities of atomic and ionic ground levels, is utilized to calculate the plasma temperature in a laser-induced plasma from an aluminum alloy target. The columnar densities are here calculated by quantifying the self-absorption of resonance lines. It is demonstrated that this is a promising method for accurate determination of plasma temperature. To validate the capability of this technique, plasma emission is measured at different gate delay times. For each delay, excitation temperature is calculated both by the conventional Saha-Boltzmann plot (by using the excited states) and by exploiting the new Columnar Density Saha–Boltzmann (CD-SB) plot. The results suggest that at later times of the plasma evolution, the CD-SB plot can be more suitable for the determination of plasma temperature than conventional Saha-Boltzmann plot. These findings provide a new approach for physical characterization of plasmas and give access to a wealth of information about the state of plasma. Keywords: Plasma, Spectroscopy, LIBS, Excitation temperature, Self-absorption, Saha-Boltzmann plot
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safi2019determinationjournal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Safi, Ali;Tavassoli, S. Hassan;Cristoforetti, Gabriele;Legnaioli, Stefano;Palleschi, Vincenzo;Rezaei, Fatemeh;Tognoni, Elisabetta;
Journal journal of advanced research
Year 2019
DOI
DOI not found
URL
http://www.sciencedirect.com/science/article/pii/S2090123219300098
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