Evaluation of laser ablation optical emission spectrometry for microanalysis in aluminium samples |
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| Institution: | 1. CEA, LSLA, Centre d''Etudes de Saclay, Bât. 391, 91 191 Gif sur Yvette, France;2. Pechiney CRV, BP 27, 38 340 Voreppe, France;1. Quality Department, Beshay Steel, Sadaat City 32897, Egypt;2. Faculty of Engineering Cairo University, Giza 12316, Egypt;3. Institute of Ferrous Metallurgy, RWTH-Aachen University, Aachen 52072, Germany;4. Central Metallurgical Research and Development Institute, Helwan 11421, Egypt;1. BioISI - Biosystems & Integrative Sciences Institute, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, C8, 1749-016 Lisboa, Portugal;2. Laboratório de Instrumentação, Engenharia Biomédica e Física da Radiação (LIBPhys-UNL), Departamento de Física, Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa, 2892-516 Caparica, Portugal;3. Laboratoire Kastler Brossel, École Normale Supérieure, CNRS, Université P. et M. Curie - U. Paris 06, Case 74; 4, place Jussieu, 75252 Paris CEDEX 05, France |
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| Abstract: | This paper presents the first evaluation of laser ablation optical emission spectrometry for elemental microanalysis in solids. All the measurements have been performed on aluminum, a matrix in which elements segregate very easily. The lateral resolution obtained is close to 6 μm. It has been evaluated both by making replicas of the small craters formed in aluminum and by making a profile of the intensity distribution of two lines (Al and Cu) across a sharp junction of these two metals. A strong dependence of the measurement reproducibility on the laser energy fluctuations has been observed. Intrinsic reproducibility of the technique has been evaluated at 8% using a stable laser source. The detection limit is around 4 ppm for Mg and 40 ppm for Cu. This surprisingly high sensitivity is mainly attributed to a very efficient coupling between the UV laser beam and the solid surface, leading to crater depths of around 5 μm for a single laser shot. Calibration curves obtained for Mg and Cu using specially fabricated samples demonstrate that the technique is quantitative and not strongly sensitive to the matrix composition. These results demonstrate the very high potential of laser ablation optical emission spectrometry for elemental microanalysis, opening a wide field of applications for this technique. |
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