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New Coil Geometries for the Study of Secondary Discharge in Atmospheric-pressure Helium Inductively Coupled Plasma Mass Spectrometry by Kaveh Jorabchi; Akbar Montaser is a Chemistry article available to read on EtoBox.

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Several coil geometries are proposed to reduce the secondary discharge in atmospheric-pressure helium inductively coupled plasma mass spectrometry (He ICPMS) using a crystal-controlled 40-MHz generator. The effectiveness of the proposed geometries in controlling the plasma potential is investigated by the Langmuir probe method and ion kinetic energy (IKE) measurements. The influence of RF power on plasma gas temperature (T g ) is investigated through measurements of ICP-mass spectrometer interface pressure and IKEs for new and conventional coil geometries. Trends in plasma potential and T g are well correlated, revealing that T g is elevated (to ~3500 K) at high power levels mainly as a consequence of the interaction between the ICP and the grounded sampler. The reduction of the secondary discharge results in lower T g values (~2600 K), necessitating the use of a membrane desolvator to remove water-related polyatomic interferences observed in the mass spectrum. Solvent removal also improves the sensitivity for bromine as a high-ionization-potential element by one order of magnitude compared to the previous studies.

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Author

Kaveh Jorabchi; Akbar Montaser

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0584-8547)

Published

2004

Language

EN

Field

Chemistry (Physical Sciences)