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On the Observation of an Atomic Fluorescence Double-Resonance Excitation Process in an ICP Induced by a Spectral Continuum Source

Volume 43, Number 4 (June 1989) Page 719-722

Mignardi, M.A.; Szabo, N.J.; Omenetto, N.; Smith, B.W.; Winefordner, J.D.

Double-resonance fluorescence refers to a process in which atoms (or molecules) are excited into the fluorescence state in a stepwise manner with two lasers tuned at appropriate atomic (or molecular) energy levels. The analytical advantage of such excitation processes as compared to that involving only one step (single-resonance fluorecence) lies in its increased spectral selectivity without a significant loss of sensitivity if both excited state transitions are saturated. Several analytical studies performed with tunable lasers in atmospheric-pressure atomizers have been reported in the literature.