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. 2004 Apr 1;109(2):185–217. doi: 10.6028/jres.109.013

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 13 — AMS: tandem accelerator at ETH, Zürich. Negative carbon ions, produced with a Cs⁺ sputter ion source, undergo low energy mass resolution and then are injected into the 4.5 MV accelerator tube. Molecular ions are destroyed by the stripper gas, and emerging 18 MeV C⁺³ beams of ¹²C, ¹³C, and ¹⁴C are mass analyzed and measured in current (stable C ions) and event (¹⁴C ions) detectors [37].