Abstract
When an analyte atomic vapour is irradiated by a monochromatic laser beam with sufficient energy density, the excited atom population (and hence fluorescence intensity) may approach saturation. Non-quenching collisions that change the Doppler shift of an excited atom may decrease by one or two orders of magnitude the amount of energy density necessary to achieve a given degree of saturation. A steady state theory is developed that allows predictions to be made from collisional rate constants.
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