Evaluation of self-absorption coefficients of manganese emission lines in Laser Induced Breakdown Spectroscopy measurements

F. BREDICE, F. O. BORGES, H. SOBRAL, M. VILLAGRÁN MUÑIZ, H. O. DI ROCCO, G. CRISTOFORETTI, S. LEGNAIOLI, V. PALLESCHI, L. PARDINI, A. SALVETTI AND E. TOGNONI.

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY

Elsevier

Año: 2006 vol. 61 p. 1294 - 1303

0584-8547

This paper is the first of a series devoted to the LIBS study of Fe-Mn alloys, with the purpose of determining the best experimental procedures for reliable quantitative measurements. In this first work, attention is pointed on the self-absorption processes, whose effect deeply influences the LIBS measurements, reflecting in non-linear calibration curves. In order to understand the basic principles and setting out the theoretical tools that will be used for the analysis of the alloys, a preliminary study was done on pure Mn; LIBS spectra were acquired in different experimental conditions, at different laser energies and different delays after the laser irradiation of the sample. Moreover, collinear double-pulse measurements were also performed. Analytical relations were derived and experimental procedures devised for calculation of the self-absorption coefficients of several Mn lines, which are important for characterization and control of the experimental conditions in which the analysis is performed.