Erlangen 2018 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 6: Accelerator Mass Spectrometry 2

MS 6.4: Hauptvortrag

Donnerstag, 8. März 2018, 11:30–12:00, R 1.020

A Gas Ion Source and its extension by Laser Ablation for Online Radiocarbon Analyses — •Christiane Yeman¹, Lukas Wacker¹, Bodo Hattendorf², Marcus Christl¹, Caroline Welte¹, and Hans-Arno Synal¹ — ¹Laboratory of Ion Beam Physics, ETH Zurich, Switzerland — ²Laboratory of Inorganic Chemistry, ETH Zurich

In 2017, 5000 gaseous samples were analysed for radiocarbon with a versatile gas interface at the gas ion source of the MICADAS (MIniCArbonDAtingSystem) at ETH Zurich. It is a fast way for radiocarbon analysis, for many applications favored over graphitization due to higher sample throughput and the smaller sample sizes that are required.
Even faster radiocarbon analyses can be achieved by using the novel laser ablation (LA) interface coupled to the AMS. A full radiocarbon record can be collected in a single measurement. The sample surface is scanned with a focused pulsed laser beam of UV light producing a gas mixture of CO, CO₂ and O₂, which is directly and continuously introduced into the gas ion source of the MICADAS.
The pros and cons of the continuous online measurements of laser ablation are compared in detail with the routine sequential gas measurements using the versatile gas interface.