Publication details
Study of laser-matter interaction conditions and their impact on classification of LIBS spectra
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| Year of publication | 2015 |
| Type | Conference abstract |
| MU Faculty or unit | |
| Citation | |
| Description | When performing LIBS measurement there is crucial role of so-called matrix effect. Matrix effect is a phenomenon where the chemical and physical properties of the material under study (its composition, type of molecules and the structure of their arrangement, types of bonds, etc.) have a significant effect on the ablation processes and consequent laser-induced plasma formation and evolution. This effect is most often perceived negatively, because it represents a major limitation of quantification. In this contribution varying of measurement conditions is studied in relation to its impact on the classification of materials. Utilization of advanced statistical methods enables classification and identification of materials on the basis of their spectra without the knowledge of absolute amounts of particular elements. However, for good results it is necessary to optimize the measurement conditions properly. This study was done using standardized materials of ores with different matrices. They were measured using LIBS system under various conditions (pulse energy, delay time) and the ideal conditions were chosen from signal to noise ratio (SNR). These spectra were then processed along with the spectra measured using ‘non-ideal’ conditions, thus more significantly suffering from matrix effect. Comparison was illustrated on the results of classification of samples according to their matrices. |
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