Calculation of elemental columnar density from self-absorbed lines in laser-induced breakdown spectroscopy: A resource for quantitative analysis
Authors: Cristoforetti G., Tognoni E.
Autors Affiliation: National Institute of Optics (INO) of the National Research Council (CNR), Via G. Moruzzi 1, 56124 Pisa, Italy
Abstract: The presence of self-absorption of emission lines is usually an undesired effect in laser-induced breakdown spectroscopy because it introduces non linear effects in the growth of line intensity versus the concentration of the emitting species. Several methods have been proposed in recent years for identifying and quantifying self-absorption in the emission spectra. After this diagnostic stage, the lines affected by self-absorption are usually disregarded; otherwise, appropriate corrective factors are applied to their intensity before the utilization for analytical purposes. Changing the point of view, this paper remarks as self-absorption can provide useful information for analyzing the composition of laser-induced plasmas and for their characterization. Whenever the extent of self-absorption is quantified, in fact, the optical depth of the line can be rapidly calculated; then, for plasmas in local thermodynamic equilibrium conditions, the columnar density of the emitting species can be derived. Assuming the plasma homogeneity, the concentration ratio between different elements can be obtained. Moreover, in particular cases, the columnar densities can be used to calculate the plasma temperature and the absolute number densities of plasma species. Some applications of the method are reported in the paper and potentialities and limitations are discussed. (C) 2012 Elsevier B.V. All rights reserved.
Journal/Review: SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume: 79-80 Pages from: 63 to: 71
KeyWords: Columnar density; Laser-induced breakdown spectroscopy; Plasma temperature; Quantitative analysis; Self-absorptionDOI: 10.1016/j.sab.2012.11.010Citations: 24data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2020-01-19References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here