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Journal Articles Spectrochimica Acta Part B: Atomic Spectroscopy Year : 2018

Local thermodynamic equilibrium in a laser-induced plasma evidenced by blackbody radiation

Abstract

We show that the plasma produced by laser ablation of solid materials in specific conditions has an emission spectrum that is characterized by the saturation of the most intense spectral lines at the blackbody radiance. The blackbody temperature equals the excitation temperature of atoms and ions, proving directly and unambiguously a plasma in local thermodynamic equilibrium. The present investigations take benefit from the very rich and intense emission spectrum generated by ablation of a nickel-chromium-molybdenum alloy. This alternative and direct proof of the plasma equilibrium state reopens the perspectives of quantitative material analyses via calibration-free laser-induced breakdown spectroscopy. Moreover, the unique properties of this laser-produced plasma promote its use as radiation standard for intensity calibration of spectroscopic instruments.
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Dates and versions

hal-02114124 , version 1 (23-05-2019)

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Jörg Hermann, David Grojo, Emanuel Axente, Valentin Craciun. Local thermodynamic equilibrium in a laser-induced plasma evidenced by blackbody radiation. Spectrochimica Acta Part B: Atomic Spectroscopy, 2018, 144, pp.82-86. ⟨10.1016/j.sab.2018.03.013⟩. ⟨hal-02114124⟩
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