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

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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 |
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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 |
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