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Selective detection...
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Andersson, P.
(författare)
Selective detection of C-13 by laser photodetachment mass spectrometry
- Artikel/kapitelEngelska2008
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Elsevier BV,2008
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LIBRIS-ID:oai:DiVA.org:su-57889
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-57889URI
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https://doi.org/10.1016/j.nimb.2008.05.126DOI
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Språk:engelska
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Sammanfattning på:engelska
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authorCount :7
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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.
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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.Stockholms universitet,Fysikum(Swepub:su)trd
(författare)
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Stockholms universitetFysikum
(creator_code:org_t)
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Ingår i:Nuclear Instruments and Methods in Physics Research Section B: Elsevier BV266:16, s. 3667-36730168-583X1872-9584
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