LIBS-MLIBS-MLIF Methods for Be Quantitative Analysis

Lev Nagli, Ariel University, Ariel, Israel (levna@ariel.ac.il)

Corresponding author: levna@ariel.ac.il

In many cases the strongest LIBS lines of atoms and ions are resonant and reabsorbed by the plasma plume, leading to the strong nonlinearity of the calibration curves. Proposed in [1], molecular LIBS (MLIBS) partly improves the situation but sometimes suffers from low sensitivity. In the next step, we combine (LIBS) with Laser-Induced Molecular Fluorescence (LIBS-MLIF) [2], allowing the increased elements limit of detection. A typical example is shown in Fig.1, which compares MLIBS and LIBS-MLIF spectra of Be in Cu/Be bronze. The MLIF  (1,1) line is about three times more intense than the strongest MLIBS (0,0) line. 

Fig.1 BeO molecules emission in MLIBS and MLIF spectra.

1. M. Gaft, L. Nagli, N. Eliezer, Y. Grisman, O. Forni, Elemental analysis of halogens using molecular emission by laser-induced breakdown spectroscopy in air, SAC B, (2014) 39-47.

2.  L. Nagli, M. Gaft, Combining Laser-Induced Breakdown Spectroscopy with Molecular Laser-Induced Fluorescence, Applied Spectroscopy 70 (2016) 585–592.