| Autor: |
Dubey, Sonali, Rai, Abhishek K., Kumar, Rohit, Rai, Awadhesh K. |
| Zdroj: |
Journal of Optics (09728821); Mar2023, Vol. 52 Issue 1, p233-241, 9p |
| Abstrakt: |
In the present article, we report the comparative results obtained from the analysis of semi-precious stones of different classes (idiochromatic, allochromatic and pseudochromatic) using laser-induced breakdown spectroscopy (LIBS) coupled with multivariate analysis. The point detection capability of LIBS is successfully applied for the identification of spatially distributed elements at various spots/colouration/bands in the gemstone and the identification of mineral inclusion in stones samples. Since chromophores or mineral inclusions are responsible for the colouration of the stones, the sensitivity of the point detection capability allows identification of the elements responsible for the colouration of the stones. This study reveals that white bands on the lapis lazuli samples correspond to the mineral calcite also a possibility of the presence of pyrite in the stone. Based on the spectral lines of the trace/minor elements, stones are classified in different groups by applying principal component analysis on LIBS spectral data of the stones. Visually distinct coloured zones are clustered in the same group due to their similar matrix. Further partial least square regression (PLSR) analysis of LIBS spectral data has been used to investigate Si concentration in stones. Therefore, we firmly believe that the results from the present work extend the application of LIBS together with multivariate analysis for the identification of the mineral responsible for different colours in semi-precious stones. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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