In conventional and laser excited molecular fluorescence spectrometry,1,2the excitation scatter and luminescence from the blank have been shown to be the major factors controlling the limits of detection. However, because of their high intensity, an increase in sensitivity (signal/concentration) is often noted with laser excitation as compared with conventional sources. From theoretical calculations,3,4as well as experimental results,5pulsed source excitation with gated detection, using time resolution, can be used to improve the signal to noise ratio, S/N, in certain instances. Pulsed lasers are very well suited for these measurements because of their high intensities and short pulse widths.