Abstract
The avalanche amplification of the laser-enhanced ionization signal of Cs atoms in a flame has been studied. Ionization of Cs atoms, enhanced by two-step excitation, was detected in hydrogen and propane flames. By employing the effect of avalanche amplification of electrons, high signal-to-noise ratio (∼104) was obtained for a 100 ppt Cs solution. The extrapolated limit of detection was 30 fg/mL (ppq).
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