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In this work the analysis by Laser Induced Breakdown Spectroscopy (LIBS) technique of copper-based alloys having different composition and performed with fs laser pulses is presented. A Nd:Glass laser (Twinkle Light Conversion, λ = 527 nm at 250 fs) and a set of bronze and brass certified standards were used. The inverse Calibration-Free method (inverse CF-LIBS) was applied for estimating the temperature of the fs laser induced plasma in order to achieve quantitative elemental analysis of such materials. This approach strengthens the hypothesis that, through the assessment of the plasma temperature occurring in fs-LIBS, straightforward and reliable analytical data can be provided. With this aim the capability of the here adopted inverse CF-LIBS method, which is based on the fulfilment of the Local Thermodynamic Equilibrium (LTE) condition, for an indirect determination of the species excitation temperature, is shown. It is reported that the estimated temperatures occurring during the process provide a good figure of merit between the certified and the experimentally determined composition of the bronze and brass materials, here employed, although further correction procedure, like the use of calibration curves, can be demanded. The reported results demonstrate that the inverse CF-LIBS method can be applied when fs laser pulses are used even though the plasma properties could be affected by the matrix effects restricting its full employment to unknown samples provided that a certified standard having similar composition is available.


Editorial Eckart Rühl, Salvatore Coluccia The First European Conference on Physical and Theoretical Chemistry 1199 Antonella Smaldone, Angela De Bonis, Agostino Galasso, Ambra Guarnaccio, Antonio Santagata, Roberto Teghil Inverse Calibration Free fs-LIBS of Copper-Based Alloys 1201 Francesco Armetta, Motshabi A. Sibeko, Adriaan S. Luyt, Delia F. Chillura Martino, Alberto Spinella, Maria Luisa Saladino Influence of the Ce:YAG Amount on Structure and Optical Properties of Ce:YAG-PMMA Composites for White LED 1219 Mauro Coduri, Michela Maisano, Maria Vittoria Dozzi, Elena