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Article Dans Une Revue Spectrochimica Acta Part B: Atomic Spectroscopy Année : 2018

Evaluation of pressure in a plasma produced by laser ablation of steel

Résumé

We investigated the time evolution of pressure in the plume generated by laser ablation with ultraviolet nanosec-ond laser pulses in a near-atmospheric argon atmosphere. These conditions were previously identified to produce a plasma of properties that facilitate accurate spectroscopic diagnostics. Using steel as sample material, the present investigations benefit from the large number of reliable spectroscopic data available for iron. Recording time-resolved emission spectra with an echelle spectrometer, we were able to perform accurate measurements of electron density and temperature over a time interval from 200 ns to 12 µs. Assuming local thermodynamic equilibrium, we computed the plasma composition within the ablated vapor material and the corresponding kinetic pressure. The time evolution of plume pressure is shown to reach a minimum value below the pressure of the background gas. This indicates that the process of vapor-gas interdiffusion has a negligible influence on the plume expansion dynamics in the considered timescale. Moreover, the results promote the plasma pressure as a control parameter in calibration-free laser-induced breakdown spectroscopy.
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Dates et versions

hal-02114127 , version 1 (23-05-2019)

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Jörg Hermann, Emanuel Axente, Valentin Craciun, Aya Taleb, Frédéric Pelascini. Evaluation of pressure in a plasma produced by laser ablation of steel. Spectrochimica Acta Part B: Atomic Spectroscopy, 2018, 143, pp.63-70. ⟨10.1016/j.sab.2018.02.015⟩. ⟨hal-02114127⟩

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