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A Study of KF3 Attenuation in an RFQ Gas Cell for 41Ca AMS

  • X-L Zhao (a1), A E Litherland (a2), J Eliades (a2), Y-C Fu (a3) and W E Kieser (a1)...


Guided by simulations using SIMION 8.1, a series of modifications were made to an experimental version of an Isobar Separator for Anions (ISA). The resulting improved version of the ISA provides a means of re-energizing the ions after they are cooled by gas collisions as they pass through the gas-filled radiofrequency quadrupoles (RFQ), and also provides higher transmission efficiencies. Reinvestigation of the separation of CaF3 and KF3 with this refined apparatus resulted in a better balance between isobar suppression and analyte transmission. KF3 was attenuated at eV energies by 4 orders of magnitude while 40% transmission of CaF3 was retained, for a 20keV CaF3 beam of Φ2mm and ±12mr. These results advance the possibility of an efficient small ISA-AMS system for both cosmogenic and medical applications of 41Ca.


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Anusiewicz, I, Sobczyk, M, Dabkowska, I, Skurski, P. 2003. An ab initio study on MgX3 and CaX3 superhalogen anions (X = F, Cl, Br). Chemical Physics 291(2):171–80.
Eliades, J. 2012. A radio frequency quadrupole instrument for use with accelerator mass spectrometry: application to low kinetic energy reactive isobar suppression and gas-phase anion reaction studies , University of Toronto. URL:
Eliades, J, Litherland, AE, Kieser, WE, Cousins, L, Ye, SJ, Zhao, X-L. 2010a. Cl/S separation using an on-line reaction cell for 36Cl measurement at low energies. Nuclear Instruments and Methods in Physics Research B 268(7–8):839–42.
Eliades, J, Zhao, X-L, Kieser, WE, Litherland, AE. 2010b. Isobar attenuation using anion-gas reactions for accelerator mass spectrometry and application to 36Cl. Geostandards and Geoanalytical Research 34(2):107–15.
Eliades, J, Zhao, X-L, Litherland, AE, Kieser, WE. 2013. On-line ion chemistry for the AMS analysis of 90Sr and 135,137Cs. Nuclear Instruments and Methods in Physics Research B 294:361–3.
Gerlich, D. 1992. Inhomogeneous RF Fields: A Versatile Tool for the Study of Processes with Slow Ions, in State Selected and State-to-State Ion-Molecule Reaction Dynamics. Part I: Experiment. Ng, C-Y, Baer, M, editors. Advances in Chemical Physics Series, Volume LXXXII. New York: John Wiley & Sons, Inc.
Gnaser, H, Golser, R. 2011. Sputtered molecular fluoride anions: HfF n and WF n . Surface and Interface Analysis 43(1–2):32–5.
Gutsev, GL, Boldyrev, AI. 1981. DVM-Xα calculations on the ionization potentials of MXk+1 complex anions and the electron affinities of MXk+1 “superhalogens.” Chemical Physics 56(3):277–83.
Kieser, WE, Eliades, J, Litherland, AE, Zhao, X-L, Cousins, L, Ye, SJ. 2010. The low-energy isobar separator for anions: progress report. Radiocarbon 52(2):236–42.
Kubik, PW, Elmore, D. 1989. AMS of 41Ca using the CaF3 negative ion. Radiocarbon 31(3):324–6.
Lo, S, Hopkinson, AC. 2011. Superhalogen plus anion KF3 : a recently discovered anion with the formula MXk+2 . Computational and Theoretical Chemistry 973:912.
Wang, X-B, Ding, C-F, Wang, L-S, Boldyrev, AI, Simons, J. 1999. First experimental photoelectron spectra of superhalogens and their theoretical interpretations. Journal of Chemical Physics 110:4763–71.
Zhao, X-L, Eliades, J, Liu, Q, Kieser, WE, Litherland, AE, Ye, SJ, Cousins, L. 2010. Studies of anions from sputtering III: the 41K background in 41CaF3 measurement by AMS. Nuclear Instruments and Methods in Physics Research B 268(7–8):816–9.
Zhao, X-L, Litherland, AE, Eliades, J, Kieser, WE. 2013. Partial fragmentation of CaF3 at low MeV energies and its potential use for 41Ca measurement. Nuclear Instruments and Methods in Physics Research B 294:369–73.


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