Abstract
A unique technique for simultaneous monitoring of thermally induced molecular and atomic species is used to investigate vaporization mechanisms for the rubidium analyte-tantalum furnace system used in atomic absorption analyses. The method involves combining atomic absorption and mass spectrometric techniques in order to achieve multiple probe capability; ultra-high vacuum techniques are incorporated in order to control the ambient environment. The results demonstrate the utility of this approach. Surface interactions are found to control the vaporization processes over a wide temperature range. At “low temperature” this surface interaction forms the oxide of the analyte, and at “high temperature” free rubidium atoms, which have been chemisorbed on the tantalum oxide surface, are desorbed as the tantalum oxide vaporizes.
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