Abstract

Matrix effects limit the performance of LIBS in absolute elemental analysis, since the spectral intensity of an emission line at a given concentration depends on the matrix. On the other hand, several characteristics of the plasma morphology depend on the matrix as well. Therefore, understanding the interrelation between plasma morphology and the matrix effects may result in releasing LIBS analysis from the necessity of obtaining independent information on the sample matrix. Preliminary results indicate that morphological data, which can be readily obtained, may provide the necessary information on the most important matrix characteristics, such that the proper calibration plot can be utilized for obtaining the required concentration. Moreover, once the interrelations between the matrix effects and plasma morphology have been established, one can utilize this information for performing sophisticated LIBS analysis. For example, the organic carbon content of soils can be distinguished from the total carbon, using a specific emission line, which is affected be the organic content. This way, the matrix effect is utilized for obtaining analytical information that could not be obtained by traditional LIBS.

© 2002 Optical Society of America