Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Poster Session I

A 25.9: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Electronic bridge for the x-ray Mössbauer transition in ⁵⁷Fe — •Pavlo Bilous and Adriana Pálffy — Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, D-69117 Heidelberg, Germany

The 14.4 keV transition coupling the first excited state to the ground state in the isotope ⁵⁷Fe is widely used for Mössbauer absorption spectroscopy. The commissioning of the first x-ray free electron laser (XFEL) sources render possible both direct excitation of this transition [1] but also alternative ways involving two-photon transitions. Here we investigate the excitation of the nuclear 14.4 keV state with two x-ray beams at approximately equal energies at an x-ray laser facility such as SACLA or LCLS. Apart from the process of direct absorption of two photons by the nucleus we investigate excitation of the nuclear state via the electronic bridge process in the atomic shell. Our results show that the direct two-photon excitation of the ⁵⁷Fe nucleus is highly unlikely whereas the excitation via electronic bridge may reach measurable rates.

[1] A. I. Chumakov el., Nature Phys. in press (2017)