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Unravelling Quasi-Continuous 14C Profiles by Laser Ablation AMS

Published online by Cambridge University Press:  09 December 2019

C Yeman Open the ORCID record for C Yeman [Opens in a new window] ,
M Christl Open the ORCID record for M Christl [Opens in a new window] ,
B Hattendorf ,
L Wacker ,
C Welte ,
N Brehm  and
H-A Synal
C Yeman*
Affiliation:
Laboratory of Ion Beam Physics, ETH Zurich, Otto-Stern-Weg 5, HPK, 8093Zurich, Switzerland
M Christl
Affiliation:
Laboratory of Ion Beam Physics, ETH Zurich, Otto-Stern-Weg 5, HPK, 8093Zurich, Switzerland
B Hattendorf
Affiliation:
Laboratory of Inorganic Chemistry, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, HCI, 8093Zurich, Switzerland
L Wacker
Affiliation:
Laboratory of Ion Beam Physics, ETH Zurich, Otto-Stern-Weg 5, HPK, 8093Zurich, Switzerland
C Welte
Affiliation:
Laboratory of Ion Beam Physics, ETH Zurich, Otto-Stern-Weg 5, HPK, 8093Zurich, Switzerland
N Brehm
Affiliation:
Laboratory of Ion Beam Physics, ETH Zurich, Otto-Stern-Weg 5, HPK, 8093Zurich, Switzerland
H-A Synal
Affiliation:
Laboratory of Ion Beam Physics, ETH Zurich, Otto-Stern-Weg 5, HPK, 8093Zurich, Switzerland
*
*Corresponding author. Email: yemanc@phys.ethz.ch.
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Abstract

Laser ablation (LA) accelerator mass spectrometry (AMS) is a novel method for rapid online radiocarbon (14C) analysis of carbonates. The quasi-continuous 14C profiles obtained with this technique demand a customized data evaluation protocol to relate the acquired 14C data to the analyzed sample. We take into account the mixing effects due to the minimal counting (integration) time of the AMS, the finite width of the laser beam and the gas washout of the ablation volume. Thereby we mathematically describe our LA setup with a system function that acts on the produced CO/CO2 (COX) from the sample resulting in a mixing of the 14C profiles obtained by AMS analysis. Furthermore, we analyze the long-term target memory effect in the gas ion source and establish a routine for correction. The correction routine is tested with a stalagmite comprising a growth stop that is analyzed at different scanning velocities indicating that only the slow scanning velocity can provide the necessary resolution to determine the width of the growth stop of 365 μm.

Keywords

carbonatesgas ion sourcelaser ablationonline 14C analysis
Type
Research Article
Information
Radiocarbon , Volume 62 , Issue 2 , April 2020 , pp. 453 - 465
Copyright
© 2019 by the Arizona Board of Regents on behalf of the University of Arizona

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