High-speed video images of helium inductively coupled plasmas for mass spectrometry

Journal article

Authors/Editors

Masamba, Wellington

Research Areas

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Publication Details

Author list: Iacone LA, Minnich MG, Masamba WRL, Nam SH, Montaser A, Michel RG

Publisher: Elsevier

Place: OXFORD

Publication year: 1999

Journal: Spectrochimica Acta Part B: Atomic Spectroscopy (0584-8547)

Journal acronym: SPECTROCHIM ACTA B

Volume number: 54

Issue number: 13

Start page: 1919

End page: 1928

Number of pages: 10

ISSN: 0584-8547

Languages: English-Great Britain (EN-GB)

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Abstract

High-speed video images of helium inductively coupled plasmas (He ICPs) were obtained at a rate of 1000 frames/s under conditions suitable for mass spectrometry (MS). These experiments established, for the first time, that the He ICP is a rotating discharge at the forward powers (500-1000 W) used for He ICPMS. The rotational frequency of the He ICP ranged from 80 to 250 Hz, depending on the forward power and whether analyte was introduced. When not coupled to the mass spectrometer, the rotational frequency of the He ICP decreased slightly as the forward power was increased. Coupling of the plasma to the mass spectrometer resulted in enhanced plasma oscillations. The implications of these variations on the sensitivity and precision of analytical measurements are discussed. Results are contrasted with data obtained for the Ar ICP. (C) 1999 Elsevier Science B.V. All rights reserved.

Keywords

argon inductively coupled plasma mass spectrometry, helium inductively coupled plasma mass spectrometry, high-speed video, noise, plasma rotation

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