Laser-Induced Intermodulated Flame Fluorescence: A New Approach to Scattering Correction in Analytical Atomic Fluorescence

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It is shown that the technique of intermodulated fluorescence can effectively correct for scattering problems in analytical flame fluorescence spectroscopy. When two laser beams, amplitude-modulated at different frequencies f 1 and f 2 and counterpropagated colinearly throughout an atomizer, are tuned to the absorption transition of the element of interest, non-linear mixing of the fluorescence signal results, due to saturation effects. By extraction of the signal at the sum or difference frequency, f 2 ± f 2, the linear scattering component of the spectrum can be essentially eliminated. This has been demonstrated for a sodium solution nebulized in a premixed, laminar, argon-oxygen-hydrogen flame. Because the modulation signal can be observed only at the intersection volume between the two beams, this technique constitutes a powerful tool for spatially resolved combustion diagnostics.

Keywords: Flame atomic fluorescence spectroscopy

Document Type: Research Article


Affiliations: 1: Department of Chemistry, University of Florida, Gainesville, Florida 32611; on leave from: Joint Research Centre, Chemistry Division, Ispra (Varese), Italy 2: Department of Chemistry, University of Florida, Gainesville, Florida 32611

Publication date: September 1, 1984

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