Abstract
A specially designed hollow cathode type atomizer for laser excited atomic fluorescence spectrometry was investigated. The potentialities of the device were examined by the determination of the lead contents in state reference materials of pure copper. Continuous wave (cw) and pulse modes of the glow discharge were studied. The formation of the sputtered atom flux for the particular geometry of the atomizer was theoretically calculated. Based on these calculations, theoretical calibration curves for cw and pulse modes were constructed. These curves differed from the experimental ones by less than a factor of five. The possible reasons of such a discrepancy are discussed. A limit of detection (3σ) of 40 ng g was obtained. The value may be improved by a factor of 60 by optimizing the parameters of the glow discharge. In addition, a new atomizer, a planar magnetron was investigated and detection limits of 3 ng g were obtained for lead in copper and silicon in germanium in preliminary experiments.
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