FIELD: mass-spectrometry in high-sensitivity component analysis of solids, gases, and liquids.
SUBSTANCE: proposed method for reducing background level of glow-discharge ion source incorporating hollow cathode includes reduction of desorption intensity of pollutants from surfaces of discharge-chamber parts by reducing plasma density in discharge chamber while reducing pressure of plasma-forming gas. Novelty is that hollow cathode used for the purpose is made of getter material and sprayed within discharge chamber just before analyzing the specimen. High-melting materials having minimal number of isotopes, such as Ta, Nb, and Co, can be used as getter material.
EFFECT: enhanced productivity and sensitivity of analysis.
2 cl, 2 dwg
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