Greifswald 2024 – wissenschaftliches Programm
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SYEC: Symposium Lasers and Photonic Technologies for Environmental Challenges
SYEC 5: Photonic Measurement Technology for the Environment
SYEC 5.3: Vortrag
Dienstag, 27. Februar 2024, 18:00–18:15, ELP 6: HS 4
ArTTA - Dating of environmental samples with 39Ar — •David Wachs1,2, Joshua Marks1, Pascal Bohleber3,4, Andrea Fischer3, Yannis Arck1, Martin Stocker-Waldhuber3, Julian Robertz2, Markus Oberthaler2, and Werner Aeschbach1 — 1Institute of Environmental Physics, Heidelberg — 2Kirchhoff-Institute for Physics, Heidelberg — 3Institute for Interdisciplinary Mountain Research, Innsbruck, Austria — 4Ca* Foscari University of Venice, Venice, Italy
Argon Trap Trace Analysis (ArTTA) for measuring 39Ar concentrations represents an applied quantum technology to perform age dating of environmental samples. The isotope 39Ar with its half life of 268 years uniquely enables dating in the age range between 50 and 1000 years. The very low isotopic abundance of about 10−15 however sets high demands on the measurement method. ArTTA has reduced the required sample sizes to routinely applicable amounts and thus enables 39Ar age measurements in various settings from oceans over groundwater to glaciers. This work aims at presenting the technical concept of the ArTTA analytical method, from the initial excitation of the atoms by plasma discharge to the trapping by laser cooling methods and the current challenges and upgrades of the system. Furthermore, environmental applications will be discussed with a focus on the dating of Alpine glaciers. In this environmental archive, the age itself can provide information about environmental changes and processes.
Keywords: age dating; glaciers; 39Ar; quantum technology; Atom Trap Trace Analysis (ATTA)