Bonn 2025 – scientific programme

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MO: Fachverband Molekülphysik

MO 15: Interaction with VUV and X-ray Light I (joint session A/MO)

MO 15.4: Talk

Wednesday, March 12, 2025, 11:45–12:00, GrHS Mathe

Superradiant Parametric Mössbauer Radiation Source — •Ze-an Peng, Christoph H. Keitel, and Jörg Evers — Max Planck Institute for Nuclear Physics, Heidelberg, Germany

Mössbauer nuclei facilitate a broad range of applications due to their extremely narrow resonance at x-ray frequency. However, it also renders a strong excitation via x-rays challenging. Here, we propose to construct a superradiant parametric Mössbauer radiation source, which is based on coherently modulated electron bunches exiting from x-ray free-electron laser (XFEL) undulator and passing through a crystal containing Mössbauer isotopes. Due to the constructive interference between the virtual-photon fields of different electrons in a single XFEL electron bunch, the intensity of Mössbauer radiation generated from the crystal can be boosted superradiantly, which scales with the square of electron number of XFEL electron bunch. This tremendous superradiant boost of Mössbauer radiation is also realized by a new geometry we proposed, which can be optimized by experimentally simple ways. Our study bears potential to enable coherent Mössbauer pump-probe spectroscopy, as well as nonlinear Mössbauer optical effects triggered by coherent XFEL electron beam.

[1] O. D. Skoromnik, I. D. Feranchuk, J. Evers, and C. H. Keitel, Phys. Rev. Accel. Beams 25, 040704 (2022).

Keywords: Parametric radiation; Mössbauer nuclei; X-ray free-electron laser; Coherent electron beam