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

Pramana

K Mridul²  R Nayak²  G Gupta¹  V K Unnikrishnan²  K Alti²  C Santhosh1²  B M Suri¹  V B Kartha² 

[1] Laser and Plasma Technology Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$;Centre for Atomic and Molecular Physics, Manipal University, Manipal 576 104, India$$

关键词: Laser-induced plasma;    plasma spectroscopy;    quantitative elemental analysis.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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 experimentally measured spectral intensity values with the basic physics of the plasma is developed. Using the algorithm, the Zn and Cu concentratioins in the brass sample are determined. The analytical result obtained from the CF-LIBS technique agree well with the certified valued of the elements in the sample, with an accuracy error < 1%

【 授权许可】

Unknown