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

Published online by Cambridge University Press:  09 February 2016

X-L Zhao ,
A E Litherland ,
J Eliades ,
Y-C Fu  and
W E Kieser
X-L Zhao*
Affiliation:
Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, ON, K1N 6N5, Canada
A E Litherland
Affiliation:
IsoTrace Laboratory, University of Toronto, 60 St. George St., Toronto, ON, M5S 1A7, Canada
J Eliades
Affiliation:
IsoTrace Laboratory, University of Toronto, 60 St. George St., Toronto, ON, M5S 1A7, Canada
Y-C Fu
Affiliation:
Institute of Earth Environment, Chinese Academy of Sciences, No. 10 Fenghui South Road, Hi-Tech Zone, Xi'an 710075, China
W E Kieser
Affiliation:
Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, ON, K1N 6N5, Canada
*
2Corresponding author. [email protected].
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Abstract

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.

Type
Articles
Information
Radiocarbon , Volume 55 , Issue 2: Proceedings of the 21st International Radiocarbon Conference (Part 1 of 2) , 2013 , pp. 268 - 281
Copyright
Copyright © 2013 by the Arizona Board of Regents on behalf of the University of Arizona 

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References

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.CrossRefGoogle Scholar
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: https://tspace.library.utoronto.ca/handle/1807/32706.Google Scholar
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.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
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. Google Scholar
Gnaser, H, Golser, R. 2011. Sputtered molecular fluoride anions: HfF n − and WF n − . Surface and Interface Analysis 43(1–2):32–5.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
Kubik, PW, Elmore, D. 1989. AMS of 41Ca using the CaF3 negative ion. Radiocarbon 31(3):324–6.CrossRefGoogle Scholar
Lo, S, Hopkinson, AC. 2011. Superhalogen plus anion KF3 −: a recently discovered anion with the formula MXk+2 − . Computational and Theoretical Chemistry 973:9–12.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar
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.CrossRefGoogle Scholar