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Reduction of multip...
Reduction of multiple hits in atom probe tomography
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- Thuvander, Mattias, 1968 (författare)
- Chalmers University of Technology, Göteborg, Sweden,Chalmers tekniska högskola
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- Kvist, Anders, 1961 (författare)
- Chalmers University of Technology, Göteborg, Sweden,Chalmers tekniska högskola
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- Johnson, Lars (författare)
- Linköpings universitet,Tunnfilmsfysik,Tekniska högskolan,Linköping University
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- Weidow, Jonathan, 1980 (författare)
- Chalmers University of Technology, Göteborg, Sweden,Chalmers tekniska högskola
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- Andrén, Hans-Olof, 1947 (författare)
- Chalmers University of Technology, Göteborg, Sweden,Chalmers tekniska högskola
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(creator_code:org_t)
- Elsevier, 2013
- 2013
- Engelska.
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Ingår i: Ultramicroscopy. - : Elsevier. - 0304-3991 .- 1879-2723. ; 132, s. 81-85
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Abstract
Ämnesord
Stäng
- The accuracy of compositional measurements using atom probe tomography is often reduced because some ions are not recorded when several ions hit the detector in close proximity to each other and within a very short time span. In some cases, for example in analysis of carbides, the multiple hits result in a preferential loss of certain elements, namely those elements that frequently field evaporate in bursts or as dissociating molecules. In this paper a method of reducing the effect of multiple hits is explored. A fine metal grid was mounted a few millimeters behind the local electrode, effectively functioning as a filter. This resulted in a decrease in the overall detection efficiency, from 37% to about 5%, but also in a decrease in the fraction of multiple hits. In an analysis of tungsten carbide the fraction of ions originating from multiple hits decreased from 46% to 10%. As a result, the measured carbon concentration increased from 48.2 at%to 49.8 at%, very close to the expected 50.0 at%. The characteristics of the multiple hits were compared for analyses with and without the grid filter.
Ämnesord
- NATURVETENSKAP -- Kemi -- Analytisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
Nyckelord
- Atom probe tomography
- Multiple hits
- Detection efficiency
- Quantification
- Carbides
- Tungsten carbide
- TECHNOLOGY
- TEKNIKVETENSKAP
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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