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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:	https://doi.org/10.1039/D0JA00488J
Copyright Information:	© The Royal Society of Chemistry 2021
Related URLs:	Google Scholar: Danyushevsky, L UTAS Profile: Danyushevsky, L UTAS Profile: Olin, P
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