Exploiting Self-Absorption for Plasma Characterization in Laser-Induced Breakdown Spectroscopy Experiments:
A Comparison of Two Recent Approaches

Year: 2019

Authors: Safi A., Tavassoli H.S., Cristoforetti G., Tognoni E., Campanella B., Legnaioli S., Pagnotta S., Poggialini F., Palleschi V.

Autors Affiliation: Laser and Plasma Research Institute, Shahid Beheshti University, G. C. Evin, Tehran, Iran
National Institute of Optics of the National Research Council (INO-CNR), Via G. Moruzzi 1, Pisa, Italy
Institute of Chemistry of Organometallic Compounds, Via G. Moruzzi 1, Pisa, Italy

Abstract: In this article, we compare two analytical methods that have been recently proposed: the columnar density
Saha−Boltzmann plot method of Cristoforetti and Tognoni (Cristoforetti, G.; Tognoni, E. Spectrochim. Acta, Part B, 2013, 79−
80, 63−71) and the C-sigma model of Aragon and Aguilera (Aragon, C.; Aguilera, J. A. J. Quant. Spectrosc. Radiat. Trans. 2014,
149, 90−102). Both methods are based on the exploitation of self-absorbed lines for the characterization of plasmas in laserinduced
breakdown spectroscopy experiments. However, although the two methods can be safely applied in many cases, their
usefulness is limited in many practical cases of interest because of the intrinsic constraints of the used plasma model or because
of the complexity of the numerical treatment. The two methods are presented here and critically discussed. Finally, an extended
C-sigma approach is proposed to merge the advantages of the two methods, overcoming their intrinsic limitations and
simplifying the numerical treatment.


Volume: 91 (13)      Pages from: 8595  to: 8601

KeyWords: Laser-induced plasma; self-absorption; plasma diagnostics
DOI: 10.1021/acs.analchem.9b01885

Citations: 21
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