OPTIMIZATION OF DETECTION OF ATOMIC-ABSORPTION LINES IN INTRACAVITY LASER SPECTROSCOPY

An intracavity laser spectrometer equipped with a graphite furnace ele ctrothermal atomizer and two alternative types of narrow atomic lines detection schemes (high resolution diffraction spectrograph with optic al multichannel analyzer or a resonant detector based on a hollow-cath ode lamp) is described. Such system was used to determine ultra-trace amounts of lithium and strontium in aqueous solutions. A significant r eduction in the measurable absorbance was demonstrated for both elemen ts. Careful optimization of the operating conditions of the detection systems and a comparison of their typical features and advantages were performed.