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Selective detection...
Selective detection of C-13 by laser photodetachment mass spectrometry
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Andersson, P. (författare)
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Sandstrom, J. (författare)
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Hanstorp, D. (författare)
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Gibson, N. D. (författare)
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Wendt, K. (författare)
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Pegg, D. J. (författare)
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- Thomas, R. D. (författare)
- Stockholms universitet,Fysikum
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(creator_code:org_t)
- Elsevier BV, 2008
- 2008
- Engelska.
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Ingår i: Nuclear Instruments and Methods in Physics Research Section B. - : Elsevier BV. - 0168-583X .- 1872-9584. ; 266:16, s. 3667-3673
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- In this paper, we demonstrate how laser photodetachment mass spectrometry (LPMS) can be used to selectively detect C-13(-) ions in the presence of C-12(-) ions in a low energy ion beam. An isotopically enriched beam of carbon ions consisting of equal amounts of C-13(-) and 12C- ions was extracted from an ion source. The ions interacted with a laser beam in a collinear geometry over a distance of 70 cm. Residual atoms produced in the photodetachment process were detected in a neutral particle detector placed downstream of the collinear interaction region. By making use of the Doppler effect we were able to selectively photodetach C-13(-) ions. The number of detected C-13 atoms was 13 times larger than the number of detected C-12 atoms. The population of the excited, weakly bound D-2 excited state of the C- ion was depleted by the use of a second laser. This significantly reduced the background accompanying the signal arising from the photodetachment of the S-4 ground state C- ion. Different applications of the LPMS method will be discussed in the paper.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- negative ion
- photodetachment
- radiocarbon
- isotope selection
- mass spectrometry
- Physics
- Fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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