3.2. LIBS instrumental optimization
The success of the LIBS analysis depends on the choice of best
emission wavelength and the use of ideal instrumental parameters.
The effect of spot size, laser repetition rate, laser energy, number of
laser pulses and delay time on the analytical results were checked
by the monitoring of an integrated area of atomic/ionic emission
peaks and the signal background ratio (SBR). Besides influence of
vertical distance above sample surface and pressure of surrounding
gas are also important instrumental parameters [15], the instrument
used in this work does not allow their optimization. At least
two emission wavelengths were evaluated for each element; however,
as their behavior was similar, only K(I) 766.49 and Mg(II)