Abstract
Sputter atomization of sample material into a constricted, energetic plasma yields a stable, low-cost source for solids analysis by atomic emission spectrometry. The hollow cathode plume (HCP) operates in a reduced pressure (1-5 torr) argon atmosphere at currents up to 200 mA and powers less than 70 W. The plume emerges through a small orifice (1.5 mm) in a disk that forms the analytical sample. Sample atoms are ejected directly into the base of the plume where subsequent excitation occurs. Characteristics of the HCP relative to its analytical use for bulk solids analysis, including stability and reproducibility, are presented. Short- and long-term stability of the source, as well as its intersample reproductibility, are shown in the analysis of National Bureau of Standards steel and zinc-base alloys. 37 references, 8 figures, 2 tables.
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