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Aragón Garbizu, Carlos

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https://academica-e.unavarra.es/handle/2454/48553

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Aragón Garbizu

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Carlos

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InaMat2. Instituto de Investigación en Materiales Avanzados y Matemáticas

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0000-0003-1737-6402

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433

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2014 - 20152
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Subject: CSigma graph ×

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Now showing 1 - 2 of 2
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    PublicationOpen Access
    CSigma graphs: a new approach for plasma characterization in laser-induced breakdown spectroscopy
    (Elsevier, 2014) Aragón Garbizu, Carlos; Aguilera Andoaga, José Antonio; Física; Fisika
    A generalization of curves of growth called CSigma (Cσ) graphs, which allows including several lines of various elements in the same ionization state at different concentrations, is proposed for laser-induced breakdown spectroscopy (LIBS) experiments. The method relies on the Boltzmann, Saha and radiative transfer equations for plasmas in local thermodynamic equilibrium. Cσ graphs are based on the calculation of a line cross section σl for each of the experimental data, starting from the atomic data of the line, the temperature and the electron density. A model of homogeneous plasma, applied separately for neutral atoms and ions, is used. A limit of validity is established for this model. Experimental Cσ graphs have been obtained using fused glass samples containing Fe, Mn, Mg, Si and Cr. By fitting experimental Cσ graphs to calculated curves, the LIBS system becomes characterized by a set of four parameters βA, Nl, T, Ne, different for neutral atoms and ions. Starting from this characterization, the intensity and self-absorption of a given spectral line of an element at a certain concentration may be predicted, provided that its atomic data are known and the limit of validity is not exceeded.
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    PublicationOpen Access
    Method for measurement of transition probabilities by laser-induced breakdown spectroscopy based on CSigma graphs. Application to Ca II spectral lines
    (Elsevier, 2015) Aguilera Andoaga, José Antonio; Aragón Garbizu, Carlos; Manrique Rosel, Javier; Física; Fisika
    We propose a method for determination of transition probabilities by laser-induced breakdown spectroscopy that avoids the error due to self-absorption. The method relies on CSigma graphs, a generalization of curves of growth which allows including several lines of various elements in the same ionization state. CSigma graphs are constructed including reference lines of an emitting species with well-known transition probabilities, together with the lines of interest, both in the same ionization state. The samples are fused glass disks prepared from small concentrations of compounds. When the method is applied, the concentration of the element of interest in the sample must be controlled to avoid the failure of the homogeneous plasma model. To test the method, the transition probabilities of 9 Ca II lines arising from the 4d, 5s, 5d and 6s configurations are measured using Fe II reference lines. The data for 5 of the studied lines, mainly from the 5d and 6s configurations, had not been measured previously.