Experimental setup. A: attenuator, BS: beam splitter, EM1: energy meter, L: lens, S: Sample, PZT: piezoelectric microphone, HV: high voltage, R: resistor, C: capacitor, IF: Interferential filter, Scope: oscilloscope, ICCD camera and monochromator, and OF: Optical fiber.
LIBS spectra obtained with 1 mJ of laser energy for (a) , (b) NaCl, and (c) .
Fluence dependence of the PA first peak amplitude for (◼) , (◯) , and NaCl.
Electric signal as function of incident energy for (◼) , (◯) , and NaCl under the same experimental conditions of Fig. 3. Distance between capacitors: 3.5 cm; voltage applied to the plates: 10 kV.
Plot of (◯) absorbed energy, (◼) energy consumed by the plasma, and the sum of these contribution vs the incident fluence for (a) , (b) , and (c) NaCl. The straight line represents the linear fit to the total energy.
Total intensity of ion emission lines as a function of the absorbed energy for (◼) Ca II, (◯) Ba II, and Na II. The solid curves represent the fit to Eq. (4).
Total intensity of neutral atoms emission line as a function of the absorbed energy for (◼) Ca I, (◯) Ba I, and Na I. The solid curves represent the fit to Eq. (4).
The difference from Eq. (4) as a function of the energy density for , , and NaCl. The solid line is only a guide for the eyes.
Electronic configuration of each level and Einstein coefficients of spontaneous emission for the transitions selected for OES measurements (Ref. 18).
Least-squares linear fit parameters of experimental data given in Figs. 5(a)–5(c).
Physical properties of halogenated earth alkaline metals together with the parameters , critical , and that characterize each sample.
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