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12 August 2008 Detection of lead in brass by laser-induced breakdown spectroscopy combined with laser-induced fluorescence
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Proceedings Volume 7099, Photonics North 2008; 709927 (2008)
Event: Photonics North 2008, 2008, Montréal, Canada
Laser-Induced Breakdown Spectroscopy (LIBS) technique combined with Laser-Induced Fluorescence (LIF) is known to be a high sensitivity and high selectivity analytical technique. Although sub-ppm limits of detection (LoD) have already been demonstrated, there is still a constant and urgent need to reach lower LoDs. Here, we report results obtained for the detection of lead trace in brass samples. The plasma was produced by a Q-switched Nd:YAG laser at 1064 nm and then re-excited by a nanosecond optical parametric oscillator (OPO) laser tuned at 283.31 nm. Emission from Pb atoms was then observed at 405.78 nm. The experiments were performed in air at atmospheric pressure. We found out that the optimal conditions were obtained for an ablation fluence of 2-3 J/cm2 and inter-pulse delay of 8-10 μs. Also, excitation energy of about 200 μJ was required to maximize the Pb(I) 405.78 nm emission. Using the LIBS-LIFS technique, the LoD was estimated to be about 180 ppb over 100 laser shots, which corresponds to an improvement of about two orders of magnitude with that obtained using conventional LIBS.
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Christian Goueguel, Stéphane Laville, Hakim Loudyi, Mohamed Chaker, Mohamad Sabsabi, and François Vidal "Detection of lead in brass by laser-induced breakdown spectroscopy combined with laser-induced fluorescence", Proc. SPIE 7099, Photonics North 2008, 709927 (12 August 2008);

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