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Abstract

In spectroscopy, observed spectral resonance lines arise from interference between probing light and light coherently scattered by the sample. A transformation of Lorentzian absorption lines into asymmetric Fano lines was demonstrated in attosecond XUV/VUV spectroscopy on helium. Our aim is to establish such dynamical phase control in resonant nuclear forward scattering of synchrotron radiation. Phase shifts are mechanically mediated and employ piezoelectric film elements. An experimental configuration to directly measure the modified spectrum at a synchrotron beam line using an iron-57 Mössbauer target is proposed. The theoretical calculations predict altered transmission spectra with redistributed spectral power converting absorption into gain in a defined spectral bandwidth. In order to test the performance of the piezoelectric transducer, mechanical and electronic properties were investigated and a new time-differential Mössbauer spectroscopy setup for iron-57 was built, which allows for analysing the perturbed scattering process in the time domain.