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Elimination of aliasing in LA-ICP-MS by alignment of laser and mass spectrometer

Norris, CA, Danyushevsky, L ORCID: 0000-0003-4050-6850, Olin, P and West, NR 2021 , 'Elimination of aliasing in LA-ICP-MS by alignment of laser and mass spectrometer' , Journal of Analytical Atomic Spectrometry, vol. 36, no. 4 , pp. 733-739 , doi: 10.1039/D0JA00488J.

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Abstract

Insufficient sampling of periodic signals results in an unwanted phenomenon known as aliasing. When measuring by LA-ICP-MS it is widely observed that aliasing between laser pulse rates and sampling by sequential ICP-MS instruments creates erroneous variations in the measured element concentrations in the sample. Smoothing the sample flow to the ICP-MS can largely eliminate this variation but reduces spatial resolution of the time-resolved signal and is thus detrimental for imaging with the increasingly popular fast response sample cells. We have developed a fire control circuit that fires the laser in alignment with the measurement cycle of the mass spectrometer to lessen or eliminate aliasing. We describe the device and show that with a conventional quadrupole ICP-MS the technique is able to maintain measurement precision when the extent of mixing between individual laser pulses is reduced by an order of magnitude.

Item Type: Article
Authors/Creators:Norris, CA and Danyushevsky, L and Olin, P and West, NR
Keywords: LA-ICPMS, aliasing, spectral skew
Journal or Publication Title: Journal of Analytical Atomic Spectrometry
Publisher: Royal Society of Chemistry
ISSN: 1364-5544
DOI / ID Number: 10.1039/D0JA00488J
Copyright Information:

© The Royal Society of Chemistry 2021

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