Journal
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume 69, Issue -, Pages 25-31Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2012.02.008
Keywords
ICP-MS; Laser ablation; Polyatomic ions; Metal argide ions; MAr+ ions
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Funding
- U. S. Department of Energy, Office of Nuclear Nonproliferation [NA-22]
- Office of Basic Energy Sciences
- U. S. Department of Energy by Iowa State University [DE-AC02-07CH11358]
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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.
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