Enhanced spatially-resolved trace analysis using combined SIMS-single-stage AMS

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:410

Article

Grabowski, K. S.¹  Groopman, E. E.²  Fahey, A. J.³ 

[1] Naval Res Lab, 4555 Overlook Ave SW, Washington, DC 20375 USA

[2] Naval Res Lab, Natl Res Council, 4555 Overlook Ave SW, Washington, DC 20375 USA

[3] Corning Inc, Lynn Morse Rd, Painted Post, NY 14870 USA

关键词: SIMS;    AMS;    SSAMS;    Mass spectrometry;    Trace elements;    Isotopes;    Spatial;    Depth profile;   

DOI  :  10.1016/j.nimb.2017.07.025

来源: Elsevier

【 摘 要 】

Secondary ion mass spectrometry (SIMS) provides spatially resolved trace analysis of solid materials, but can be complicated by unresolved abundant molecular isobars. By adding a 300-kV single-stage accelerator mass spectrometer (SSAMS) as a detector for a Cameca ims 4f SIMS, one can measure more abundant positive ions from the SIMS while removing molecular isobars, thus improving very low abundance trace element and isotope analysis. This paper describes important features and capabilities of such an integrated system at the Naval Research Laboratory using charge state +1 ions. Transmission loss is compared to molecule destruction as gas flow to the molecule-destruction cell increases. As most measurements tolerate more modest abundance sensitivities than for C-14 analysis, a lower gas flow is acceptable, so good transmission of 20-50% for ions of interest can be maintained for a broad range of ion masses. This new instrument has measured isotope ratios for uranium, lead, rare earths, and other elements from particulates and localized regions, with molecule destruction enabling the measurement at low SIMS mass resolving power and thus high transmission, as examples will show. This new and world-unique instrument provides improved capabilities for applications in nuclear and other forensics, geochemistry, cosmochemistry, and the development of optical, electronic, multifunctional, and structural materials. Published by Elsevier B.V.

【 授权许可】

Free