Measurement error due to self-absorption in calibration-free laser-induced breakdown spectroscopy
| Autor: | Emanuel Axente, Frédéric Pelascini, Vincent Motto-Ros, Aya Taleb, Jörg Hermann, Valentin Craciun, Mauro J. Carru |
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| Přispěvatelé: | Laboratoire Lasers, Plasmas et Procédés photoniques (LP3), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Cetim Grand Est, Spectrométrie des biomolécules et agrégats (SPECTROBIO), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), National Institute for Lasers, Plasma and Radiation Physics (INFLPR), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU) |
| Rok vydání: | 2021 |
| Předmět: |
Spectral shape analysis
Observational error Chemistry Thermodynamic equilibrium elemental analysis self-absorption 01 natural sciences Biochemistry Spectral line 010305 fluids & plasmas Analytical Chemistry Computational physics laser-induced breakdown spectroscopy error evaluation [CHIM.ANAL]Chemical Sciences/Analytical chemistry 0103 physical sciences calibration-free Radiance Environmental Chemistry Laser-induced breakdown spectroscopy 010306 general physics Spectroscopy Doppler broadening |
| Zdroj: | Analytica Chimica Acta Analytica Chimica Acta, 2021, 1185, pp.339070. ⟨10.1016/j.aca.2021.339070⟩ Analytica Chimica Acta, Elsevier Masson, 2021, 1185, pp.339070. ⟨10.1016/j.aca.2021.339070⟩ |
| ISSN: | 1873-4324 0003-2670 |
| Popis: | International audience; Self-absorption of spectral lines is known to lower the performance of analytical measurements via calibration-free laser-induced breakdown spectroscopy. However, the error growth due to this effect is not clearly assessed.Here we propose a method to quantify the measurement error due to self-absorption based on the calculation of the spectral radiance of a plasma in local thermodynamic equilibrium. Validated through spectroscopic measurements for a binary alloy thin film of compositional gradient, the method evidences that measurement performance lowering due to self-absorption depends on the spectral shape of the analytical transition and on the intensity measurement method. Thus, line-integrated intensity measurements of Stark broadened lines enable accurate analysis, even at large optical thickness, if line width and plasma size are precisely known. The error growth due to self-absorption is significantly larger for line shapes dominated by Doppler broadening and for line-center intensity measurements. The findings present a significant advance in compositional measurements via calibration-free laser-induced breakdown spectroscopy, as they enable straightforward selection of most appropriate analytical lines. |
| Databáze: | OpenAIRE |
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