Calibration-free laser-induced breakdown spectroscopy for quantitative elemental analysis of materials

Unnikrishnan, VK and Mridul, K and Nayak, R and Alti, K and Kartha, VB and Santhosh, C (2012) Calibration-free laser-induced breakdown spectroscopy for quantitative elemental analysis of materials. RAMANA journal of physics, 79 (2). pp. 299-310.

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The application of calibration-free laser-induced breakdown spectroscopy (CF-LIBS) for quantitative analysis of materials, illustrated by CF-LIBS applied to a brass sample of known composition, is presented in this paper. The LIBS plasma is produced by a 355 nm pulsed Nd:YAG laser with a pulse duration of 6 ns focussed onto a brass sample in air at atmospheric pressure. The time-resolved atomic and ionic emission lines of Cu and Zn from the LIBS spectra recorded by an Echelle spectrograph coupled with a gated intensified charge coupled detector are used for the plasma characterization and the quantitative analysis of the sample. The time delay where the plasma is optically thin and is also in local thermodynamic equilibrium (LTE), necessary for the elemental analysis of samples from the LIBS spectra, is deduced. An algorithm relating the exper- imentally measured spectral intensity values with the basic physics of the plasma is developed. Using the algorithm, the Zn and Cu concentrations in the brass sample are determined. The analyti- cal results obtained from the CF-LIBS technique agree well with the certified values of the elements in the sample, with an accuracy error < 1%

Item Type: Article
Uncontrolled Keywords: Laser-induced plasma; Plasma spectroscopy; Quantitative elemental analysis.
Subjects: Departments at MU > Atomic Molecular Physics
Depositing User: KMC Manipal
Date Deposited: 20 Apr 2013 05:16
Last Modified: 20 Apr 2013 05:16

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