Stoichiometry study of laser produced plasma by optical emission spectroscopy

For quantitative multi-elemental analysis by Optical Emission Spectroscopy on Laser Produced Plasma OES-LPP., the plasma composition must be representative of the sample composition. In order to verify the stoichiometric behaviour of ablation process, the vaporisation–atomisation rates of different elements in the sample were studied. Elements are chosen for comparison purposes in term of melting point and atomic masses. Stoichiometric ablation process is verified for samples with minor elements % of Cu, Zn, and Mg.in Aluminium at two laser fluences 37 and 12 Jrcm2.. In binary samples brass., a behaviour for copper that is hard to understand is observed and stoichiometry can not be verified. q1999 Elsevier Science B.V. All rights reserved