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The effects of H2O, He, N2 and H2 on ion kinetic energies in inductively coupled plasma mass spectrometry

Citation

Thompson, JM and Houk, RS and Olin, PH and Fryer, F and Danyushevsky, LV, The effects of H2O, He, N2 and H2 on ion kinetic energies in inductively coupled plasma mass spectrometry, Spectrochimica Acta Part B: Atomic Spectroscopy, 169 Article 105870. ISSN 0584-8547 (2020) [Refereed Article]

Copyright Statement

Copyright 2020 Elsevier B.V. All rights reserved.

DOI: doi:10.1016/j.sab.2020.105870

Abstract

This study compares measurements of ion energy and the polyatomic species abundance in conventional solution inductively-coupled plasma mass spectrometry (ICP-MS) and laser ablation ICP-MS for multiple quadrupole instruments. Ion energy measurements in plasma sources have been used as a diagnostic tool for understanding processes occurring within the plasma during extraction of ions. Ion energy measurements have also allowed for determination of the nature of polyatomic species formation. In this study, ion energy measurements show that dry plasma conditions (laser ablation) result in a different ion energy distribution vs. mass compared to wet plasma (solution nebulization), suggesting a lower apparent temperature for dry plasma. The effect of helium and nitrogen or hydrogen additions to an argon plasma shows that helium is unlikely to ionize in the plasma or participate in charge transfer reactions, but primarily affects the interface pressure between the cones and the temperature of the plasma. Hydrogen addition to a dry plasma shows a slight increase in atomic ion energy, while nitrogen addition does not, and this suggests the two diatomic gases behave differently in the plasma. Investigation of ion energies with and without electrically shielding the torch shows no net benefit to using the shield for dry plasma. This behaviour, as well as differences in ion lens settings required for optimal ion beam properties, suggests different capacitive coupling between wet and dry plasma (un-shielded torch). This has implications for the optimal configurations of interface design of ICP-MS, which until now have been optimized primarily for wet plasma conditions.

Item Details

Item Type:Refereed Article
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:Thompson, JM (Mr Jay Thompson)
UTAS Author:Olin, PH (Dr Paul Olin)
UTAS Author:Danyushevsky, LV (Professor Leonid Danyushevsky)
ID Code:144699
Year Published:2020
Funding Support:Australian Research Council (IH130200004)
Web of Science® Times Cited:4
Deposited By:CODES ARC
Deposited On:2021-06-06
Last Modified:2021-07-14
Downloads:0

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