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New capabilities for small-scale and high-precision SIMS analyses

Eiler, John M. and Adkins, Jess F. and Chapman, Alan and Guan, Yunbin and Hofmann, Amy and Ferry, John (2009) New capabilities for small-scale and high-precision SIMS analyses. Geochimica et Cosmochimica Acta, 73 (13). A321. ISSN 0016-7037.

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Secondary ion mass spectrometry (SIMS) has wide application for in situ geochronology, trace element and isotope analysis. Despite the strengths of SIMS techniques, their usefulness has been limited for many problems by the relatively coarse scale of analysis (~10-30 µm), and poor precision for element abundance ratios (~1-10 %, relative). Three recent innovations in SIMS instrumentation have improved capabilities in both regards, creating opportunities for new kinds of applications: (1) The NanoSIMS provides a reduced primary beam size (typically 100-300 nm; as small as 10's of nm). A conventional SIMS instrument equipped with a Gallium source can achieve similar resolutions, though at the cost of significantly reduced sensitivity. (2) The NanoSIMS is also the first ion microprobe capable of simultaneous detection of elements differing greatly in mass (up to a factor of 22; e.g., ^(12)C and ^(238)U). This allows for multi-collection of most element ratios, much as isotope ratio multi-collection is done on lower-dispersion mass spectrometers. (3) The ims-7f Geo provides a 'pseudo multi-collection' capability. This is intended as a poor-man's instrument for high-precision isotope ratio analysis, but also permits element ratio measurements at greater than normal speed and precision.

Item Type:Article
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Adkins, Jess F.0000-0002-3174-5190
Guan, Yunbin0000-0002-7636-3735
Additional Information:© 2009 Published by Elsevier Ltd.
Issue or Number:13
Record Number:CaltechAUTHORS:20130726-092553235
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Official Citation:Goldschmidt Abstracts 2009 – E, Geochimica et Cosmochimica Acta, Volume 73, Issue 13, Supplement, June 2009, Pages A318-A347, ISSN 0016-7037,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39608
Deposited By: Tony Diaz
Deposited On:29 Jul 2013 21:56
Last Modified:26 Nov 2019 23:53

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