15 March 2013 Time-resolved LIPS of molecular bands for reliable identification of calcite in historical materials
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Proceedings Volume 8770, 17th International School on Quantum Electronics: Laser Physics and Applications; 87700B (2013) https://doi.org/10.1117/12.2014231
Event: Seventeenth International School on Quantum Electronics: Laser Physics and Applications, 2012, Nessebar, Bulgaria
Abstract
In this work the time-resolved Laser-Induced Plasma Spectroscopy (LIPS) is applied for investigation of samples containing calcium carbonate (CaCO3) which represents a marker in the identification of historical stone and pigment materials. The relatively broad bands in the range of 547-560 nm and between 580 nm and 650 nm ascribed to the CaO molecular emission are clearly observed together with the collection of sharp peaks characteristic for the atomic Ca I and ionic Ca II lines. For suppressed oxide formation processes by means of recording the spectra in the N2 environment a marked change in the time evolution of the CaO bands is observed and reaction kinetics different from that observed in air is concluded. This supports the CaO assignment and is confirmed by values of the decay time constant of 2,49 μs for nitrogen and 0,81μs for air derived from fitting of the experimental decay curves of the molecular emission. The case of CaO confirms that the time-resolved LIPS analysis provide useful supplementary data and contribute to reliability of the material identification.
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Iwona Żmuda-Trzebiatowska, Mirosław Sawczak, Panagiotis Siozos, Demetrios Anglos, Olga Kokkinaki, Gerard Śliwiński, "Time-resolved LIPS of molecular bands for reliable identification of calcite in historical materials", Proc. SPIE 8770, 17th International School on Quantum Electronics: Laser Physics and Applications, 87700B (15 March 2013); doi: 10.1117/12.2014231; https://doi.org/10.1117/12.2014231
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