Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 41: Interaction with VUV and X-ray light II
A 41.6: Vortrag
Donnerstag, 20. März 2014, 15:30–15:45, BEBEL E42
Mössbauer meets Fano at x-ray energies: Controlled line shapes in cooperative emission from nuclei — Kilian P. Heeg1, Christian Ott1, Daniel Schumacher2, Hans-Christian Wille2, Ralf Röhlsberger2, Thomas Pfeifer1, and •Jörg Evers1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
Control of spectroscopic line shapes at hard x-ray energies is demonstrated in the reflectance of a thin film cavity with embedded Moessbauer nuclei. Tunable Fano interference between a spectrally broad cavity response and a narrow bound state nuclear contribution enables us to switch between Lorentz- and Fano-profiles [1, 2]. Spectroscopic signatures such as the cooperative Lamb shift and superradiant line broadening are extracted from the recorded asymmetric line shapes with high precision and agree excellently with our theoretical model [3]. Our results advance spectroscopy and precision metrology in the hard x-ray domain, and provide access to a multitude of applications linked to Fano interference.
[1] U. Fano, Phys. Rev. 124, 1866–1878 (1961)
[2] C. Ott et al, Science 340, 716–720 (2013)
[3] K. P. Heeg, and J. Evers, Phys. Rev. A 88, 043828 (2013)