Comparison of detection limits, for two metallic matrices, of laser-induced breakdown spectroscopy in the single and double-pulse configurations

Year: 2006

Authors: Ismail M.A., Cristoforetti G., Legnaioli S., Pardini L., Palleschi V., Salvetti A., Tognoni E., Harith M.A

Autors Affiliation: National Institute of Laser Enhanced Sciences (NILES), Cairo University, Giza, Egypt;
Institute for Chemical-Physical Processes of CNR, Via G. Moruzzi 1, 56124 Pisa, Italy

Abstract: Limits of detection have been studied for several elements in aluminium and steel alloys, at atmospheric pressure in air, by use of the single and collinear double-pulse configurations of laser-induced breakdown spectroscopy. For this purpose, calibration plots were constructed for Mg, Al, Si, Ti, Cr, Mn, Fe, Ni, and Cu using a set of certified aluminium alloy samples and a set of certified steel samples. The investigation included optimization of the experimental conditions to furnish the best signal-to-noise ratio. Inter-pulse delay, gate width, and acquisition delay were studied. The detection limits for the elements of interest were calculated under the optimum conditions for the double-pulse configuration and compared with those obtained under the optimum conditions for single-pulse configuration. Significantly improved detection limits were achieved, for all the elements investigated, and in both aluminium and steel, by use of the double-pulse configuration. The experimental findings are discussed in terms of the measured plasma conditions (particle and electron density, and temperature).


Volume: 385 (2)      Pages from: 316  to: 325

KeyWords: AES; Double-pulse; Laser-induced breakdown spectroscopy; Metals/Heavy Metals; UV-visible
DOI: 10.1007/s00216-006-0363-z

Citations: 78
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