Investigation into the behavior of metal-argon polyatomic ions (MAr+) in the extraction region of inductively coupled plasma-mass spectrometry

TitleInvestigation into the behavior of metal-argon polyatomic ions (MAr+) in the extraction region of inductively coupled plasma-mass spectrometry
Publication TypeJournal Article
Year of Publication2012
AuthorsEbert CH, Witte TM, Houk RS
Journal TitleSpectrochimica Acta Part B-Atomic Spectroscopy
Volume76
Pages119-125
Date Published10
Type of ArticleArticle
ISBN Number0584-8547
Accession NumberWOS:000311008600015
Keywordscollision cell, dissociation temperature, distributions, gas-dynamics, icp mass spectrometry, icp-ms, Inductively coupled plasma ICP, interface, interferences, LASER-ABLATION, MAr plus ions, polyatomic ions, probe measurements, REDUCTION
Abstract

The abundances of metal-argon polyatomic ions (MAr+) are determined in inductively coupled plasma-mass spectrometry (ICP-MS). The ratios of MAr+ abundance to that for M+ ions are measured experimentally. These ratios are compared to expected values, calculated for typical plasma conditions using spectroscopic data. For all metals studied (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn), the measured ratios are significantly lower than the calculated ratios. Increasing the plasma potential (and thereby increasing the ion kinetic energy) by means of a homemade guard electrode with a wide gap further reduces the MAr+/M+ ratio. Implementing a skimmer cone designed for high transmission of light ions increases the MAr+ abundance. Considering this evidence, the scarcity of MAr+ ions is attributed to collision induced dissociation (CID), likely due to a shock wave at the tip of or in the throat of the skimmer cone. (C) 2012 Elsevier B.V. All rights reserved.

URL<Go to ISI>://WOS:000311008600015
DOI10.1016/j.sab.2012.06.046
Alternate JournalSpectroc. Acta Pt. B-Atom. Spectr.