Efficiency of the Laser-Induced Breakdown Spectroscopy (LIBS) has been studied as applied to the development of a
technique for elemental microanalysis of solid samples, when a rather low consumption of the sample material is
demanded allowing the technique to be practically non-destructive and applicable, e.g., at art, archaeological, forensic
and similar investigations of unique objects. Higher intensity of the laser-induced emission spectra at lower sample
erosion result in the increased efficiency of the LIBS analysis. The efficiency depends on many factors and in particular
on thermal properties of the sample material and on its excitation conditions. Here, an influence of the laser beam
focusing has been studied for samples of Al and Pb alloys having different thermal properties.
A technique is proposed of layer-by-layer laser spectral microanalysis of art pigments, using two-pulse sample atomization with one-shot spectrum registration. The analysis includes on-surface and in-depth profiling of the layer composition. The technique allows to determine distributions of chosen elements along specimen surface. The laser parameters were chosen to obtain regular laser craters of known depth and diameters. The technique has been tested and
optimized at the analysis of model samples with known compositions. The proposed method was used for investigation and ascription two painting from Nesvizh Portrait Gallery (Belarus). The results show good prospects of the LIBS as applied to paintings authentication.
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