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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:	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:	2022-06-17
Downloads:	0