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Laser-Enhanced Ionization with Avalanche Amplification: Detection of Cesium at fg/mL Levels

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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).

Keywords: AVALANCHE AMPLIFICATION; FLAME ATOMIZATION; LASER-ENHANCED IONIZATION; LIMIT OF DETECTION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370203322102780

Publication date: July 1, 2003

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