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Updated: Jul 12, 2025

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Self-absorption correction method based on intensity self-calibration of doublet lines.

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    This study introduces a new self-absorption correction method for laser-induced breakdown spectroscopy (LIBS). The technique improves spectral line intensity and measurement accuracy by using doublet lines, enhancing elemental analysis in optically thick plasmas.

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    Area of Science:

    • Spectroscopy
    • Plasma Physics
    • Analytical Chemistry

    Background:

    • Self-absorption significantly impacts spectral line intensity and measurement accuracy in optically thick plasmas.
    • Accurate elemental analysis using laser-induced breakdown spectroscopy (LIBS) is crucial in various scientific fields.

    Purpose of the Study:

    • To develop and validate a novel self-absorption correction method for LIBS.
    • To improve the accuracy and reliability of elemental concentration measurements in plasmas.

    Main Methods:

    • A self-absorption correction method based on intensity self-calibration of doublet lines from the same multiplet was proposed.
    • Calculated the K/Δλ₀ parameter and self-absorption coefficient (SA) using measured line intensities and K parameters ratios.
    • Applied the method to univariate quantitative analysis of aluminum (Al).

    Main Results:

    • The proposed method effectively reduces the influence of laser energy fluctuations, plasma plume dynamics, and element distribution.
    • The method is independent of Stark broadening coefficients, offering broader applicability.
    • Significant improvements were observed in the correlation coefficient of calibration curves and elemental content measurement accuracy for aluminum.

    Conclusions:

    • The developed self-absorption correction method offers high computation efficiency, accuracy, and applicability.
    • This technique enhances the reliability of LIBS analysis, particularly for optically thick plasmas.
    • The method provides a robust solution for accurate elemental quantification in complex plasma environments.