Abstract
Isotopically specific fluorescence detection of elemental iodine-129 has been investigated with a broad-band dye laser system. The intracavity spoiling phenomenon was utilized in this investigation to achieve isotopic specificity and to effect a modulated fluorescence signal. This rugged laser-based analytical system was found to exhibit a conventional linear relationship between signal level and analyte concentration, although laser-based instabilities limited detection limits of this approach to concentrations greater than 10/sup 10/ molecules/cm/sup 3/. Fluorescence measurements were also accomplished by direct single frequency excitation of /sup 129/I/sub 2/. This method of excitation exhibited a fluorescence detection limit of 2 x 10/sup 9/ molecules/cm/sup 3/ and proved to be more sensitive than the broad-band approach.
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