Rostock 2019 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 63: Ultracold Atoms (Trapping and Cooling)

Q 63.1: Vortrag

Freitag, 15. März 2019, 10:30–10:45, S SR 211 Maschb.

A 2D-MOT with metastable Krypton: An evaluation — •Pablo Woelk, Carsten Sieveke, Ergin Simsek, and Markus Kohler — Carl Friedrich von Weizsäcker-Zentrum für Naturwissenschaft und Friedensforschung (ZNF), Universität Hamburg

Krypton is an excellent indicator for the detection of nuclear reprocessing activities and ground water dating. The Atom Trap Trace Analysis (ATTA) promises to be the next generation instrument for measuring the concentration of Krypton isotopes in air and water samples. Here the concentration is measured by measuring the capturing rate in a MOT setup.

Challenging for a MOT setup with metastable noble gas atoms is the effective preparation into the metastable state. Usually this excitation is RF-driven, making it necessary to flush the vacuum system for hours after each measurement to avoid cross contamination.

An all optical excitation into the metastable state promises to reduce the measurement time by one order of magnitude. The question arises whether a 2D-MOT is an efficient instrument for optically excited metastable atoms, as it has proven to be for many other elements.

Here we present a thorough evaluation of our 2D-MOT/3D-MOT setup in combination with VUV plasma lamps for the excitation into the metastable state and analyze the suitability of these setups.