Abstract
The new method of atomic fluorescence detection, called saturated optical nonresonant emission spectroscopy (SONRES), has been modeled for a three-level atom, and experiments on sodium have been conducted that support the model. A rate equation analysis yielded expressions for excited-state atomic populations and saturation intensity. The detection of sodium in buffer gases that promote collisional transfer of excitation between 32P 1/2 → 32p 3/2 both without quenching the fluorescence emission and with quenching was considered. Experimental results are presented for sodium in argon. At -25°C, approximately 180 atoms/cm3were monitored with a S/N of ∼ 15 representing detection at the level of one part in 1017. The signal at this temperature was generated by less than a single atom in the laser beam.
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