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Metal argide (MAr+) ions are lost during ion extraction in laser ablation-inductively coupled plasma-mass spectrometry

TitleMetal argide (MAr+) ions are lost during ion extraction in laser ablation-inductively coupled plasma-mass spectrometry
Publication TypeJournal Article
Year of Publication2012
AuthorsWitte TM, Houk RS
Journal TitleSpectrochimica Acta Part B-Atomic Spectroscopy
Volume69
Pages25-31
Date Published03
Type of ArticleArticle
ISBN Number0584-8547
Accession NumberWOS:000303956600005
Keywordsargon, collision-induced, dissociation, electronic partition-functions, gas, helium-icp-ms, high-resolution, icp-ms, laser ablation, MAr+ ions, Metal argide ions, polyatomic ions, silane, temperature, x=0-3 bond-energies
Abstract

The abundance of metal argide (MAr+) ions during laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is measured during ablation of pure samples of transition metals. As expected, the relative abundance of MAr+ ions to M+ ions for various elements increases as the dissociation energy (D-0) of the ion increases. Gas kinetic temperatures (T-gas) are determined from the calculated MAr+/M+ ratios and are used to indicate the origins of MAr+ ions. The determined T-gas values are very high, 8000 K to >= 20,000 K. which indicate that MAr+ ions are much less abundant in the mass spectrum than expected based upon plasma conditions. Collision-induced dissociation (CID) during the ion extraction process is suggested to be responsible for removal of MAr+ ions. Factors responsible for these collisions are discussed. (C) 2012 Elsevier B.V. All rights reserved.
URL<Go to ISI>://WOS:000303956600005
DOI10.1016/j.sab.2012.02.008
Alternate JournalSpectroc. Acta Pt. B-Atom. Spectr.