Taking the edible salt as a model sample of complex granular matters,the stability of laser-induced breakdown spectroscopy(LIBS)from microelements in complex granular matters has been studied.We measured the intensities of emission spectral lines from four typical microelements(Ca,Sr,Mg,and Fe)in the sample at different experimental conditions ranging from 250 nn to 465 nm(see Fig.1).We extracted the relative standard deviation(RSD)and signal to ratio of each spectral line as functions of the laser-focus position to the surface of sample,the number of laser pulse to accumulate a spectrum,and the delayed time to record the spectral lines after laser pulse.This leads us to determine the most optimal conditions for synchronously detecting the four microelements.
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