AI Article Synopsis
- The study compared the performance of femtosecond and nanosecond lasers in laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS), focusing on how ultrafast lasers reduce thermal-induced chemical fractionation.
- Femtosecond laser ablation produced cleaner crater morphologies with minimal thermal effects, resulting in more precise and accurate measurements of elemental ratios (like Pb/U and Pb/Th) compared to the nanosecond laser.
- The femtosecond laser's calibration was found to be less dependent on the sample matrix, making it more versatile for analyzing various materials, including NIST glasses, monazites, and zircon.
Article Abstract
We compared the analytical performance of ultraviolet femtosecond and nanosecond laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). The benefit of ultrafast lasers was evaluated regarding thermal-induced chemical fractionation, that is otherwise well known to limit LA-ICPMS. Both lasers had a Gaussian beam energy profile and were tested using the same ablation system and ICPMS analyzer. Resulting crater morphologies and analytical signals showed more straightforward femtosecond laser ablation processes, with minimal thermal effects. Despite a less stable energy output, the ultrafast laser yielded elemental (Pb/U, Pb/Th) and Pb isotopic ratios that were more precise, repeatable, and accurate, even when compared to the best analytical conditions for the nanosecond laser. Measurements on NIST glasses, monazites, and zircon also showed that femtosecond LA-ICPMS calibration was less matrix-matched dependent and therefore more versatile.
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