Effects of non-uniformity of laser induced plasma on plasma temperature and concentrations determined by the Boltzmann plot method: implications from plasma modeling

Year: 2010

Authors: Gornushkin I.B., Shabanov S.V., Merk S., Tognoni E., Panne U.

Autors Affiliation: BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Straße 11, 12489 Berlin, Germany; Department of Mathematics, University of Florida, Gainesville, USA;
National Institute of Optics of the National Research Council (INO-CNR), Pisa, Italy;
Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Straße 2, 12489 Berlin, German

Abstract: The validity of the popular Boltzmann plot method was theoretically tested for the case of a non-homogeneous non-isothermal laser-induced plasma. A collisional-dominated plasma model was employed to generate synthetic spectra by solving the radiative transfer equation. The spectra were processed with homemade software that calculated values for the plasma temperature and concentrations using the Boltzmann plot approach. Both static and dynamic plasmas were investigated at various temperature and density gradients. The plasma parameters obtained from the Boltzmann plots were subsequently compared with the exact parameters of the model. The results are shown to have a direct implication for calibration-free laser-induced breakdown spectroscopy (CF-LIBS). For nearly all tested situations, the Boltzmann plot method was capable of semi-quantitative analysis providing the accurate determination of concentrations for main plasma components and failing to accurately predict the concentrations of minor components and trace elements.


Volume: 25 (10)      Pages from: 1643  to: 1653

More Information: Financial support from the DFG-NSF grant GO 1848/1-1 and NI 185/38-1 (USA, Germany) is gratefully acknowledged.
DOI: 10.1039/c0ja00016g

Citations: 42
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