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A: Fachverband Atomphysik

A 12: Poster I

A 12.7: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Exploring time-, frequency- and phase-resolved measurement techniques with Mössbauer nuclei — •Lukas Wolff and Jörg Evers — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

Mössbauer nuclei form a versatile platform for spectroscopy and quantum optics at hard x-ray energies owing to their extremely narrow line-widths and exceptional coherence properties. The development of novel x-ray sources and recent theoretical progress in x-ray cavity-QED can open a path towards a plethora of nonlinear and non-equilibrium phenomena. To characterize these phenomena in experiment and to compare with theoretical predictions, advanced measurement and data analysis techniques are required.
As one example, this poster reviews a data acquisition technique which uses single-line nuclear reference absorbers to record time- and frequency-resolved Nuclear Resonant Scattering spectra at accelerator-based x-ray sources. These spectra can be interpreted via a Fourier transform along the time axis thus providing direct access to the nuclear target spectrum, including phase information. This is of primary interest for the characterization of collective level schemes in thin-film x-ray cavities. Our findings are validated by evaluation of numerical data using the software package pynuss.
The poster further discusses a perturbative expansion of the nuclear density matrix that can be used to devise multi-pulse experiments with Mössbauer nuclei to access nonlinear and time-dependent phenomena. These multi-pulse schemes can build upon recent experimental work on coherent control of nuclei and x-ray pulse-shaping.