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Article Dans Une Revue Analytica Chimica Acta Année : 2021

Measurement error due to self-absorption in calibration-free laser-induced breakdown spectroscopy

Résumé

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.
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Dates et versions

hal-03352491 , version 1 (23-09-2021)

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Aya Taleb, Vincent Motto-Ros, Mauro Carru, Emanuel Axente, Valentin Craciun, et al.. Measurement error due to self-absorption in calibration-free laser-induced breakdown spectroscopy. Analytica Chimica Acta, 2021, 1185, pp.339070. ⟨10.1016/j.aca.2021.339070⟩. ⟨hal-03352491⟩
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