Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 22: Poster Session - Atomic Physics III

A 22.20: Poster

Wednesday, March 11, 2020, 16:00–18:00, Empore Lichthof

Phase-sensitive spectroscopy of Mössbauer nuclei using oscillating reference absorbers — •Benedikt Herkommer and Jörg Evers — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Mössbauer nuclei feature exceptionally narrow resonances at hard x-ray energies, which form the basis for a multitude of applications across the natural sciences. However, a direct spectroscopy at modern x-ray sources such as synchrotrons or XFELs is challenging, because of the broad spectral bandwidth of the delivered x-ray pulses, and because of a limited spectral resolution offered by x-ray detectors.

Here, we present a novel spectroscopy technique based on a moving reference absorber mounted on a piezo transducer. The motion induces sidebands to the spectrum of the absorber, which we scan across the spectrum of an unknown sample to be measured. As compared to previous methods, the phase offset of the piezo motion at the x-ray time-of-arrival offers an additional controllable degree of freedom. We show that this phase not only allows us to accurately determine the spectrum of the unknown sample, but also to measure the spectral phase of the light scattered by the nuclei.