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


Norris, CA and Danyushevsky, L and Olin, P and West, NR, Elimination of aliasing in LA-ICP-MS by alignment of laser and mass spectrometer , Journal of Analytical Atomic Spectrometry, 36, (4) pp. 733-739. ISSN 1364-5544 (2021) [Refereed Article]

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© The Royal Society of Chemistry 2021

DOI: doi:10.1039/D0JA00488J


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 Details

Item Type:Refereed Article
Keywords:LA-ICPMS, aliasing, spectral skew
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Analytical spectrometry
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Danyushevsky, L (Professor Leonid Danyushevsky)
UTAS Author:Olin, P (Dr Paul Olin)
ID Code:148687
Year Published:2021
Web of Science® Times Cited:5
Deposited By:CODES ARC
Deposited On:2022-02-02
Last Modified:2022-11-03

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