Europhys. Lett.
Volume 66, Number 4, May 2004
Page(s) 506 - 512
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 01 May 2004
Europhys. Lett., 66 (4) , pp. 506-512 (2004)
DOI: 10.1209/epl/i2003-10235-7

Exo-interferometric phase determination in nuclear resonant scattering

W. Sturhahn, C. L'abbé and T. S. Toellner

Advanced Photon Source, Argonne National Laboratory - Argonne, IL 60439, USA

(Received 6 October 2003; accepted in final form 17 March 2004)

The time-dependent phase change of X-rays after transmission through a sample has been determined experimentally. We used an X-ray interferometer with a reference sample containing sharp nuclear resonances to prepare a phase-controlled X-ray beam. A sample with similar resonances was placed in the beam but outside of the interferometer; hence our use of the term "exo-interferometric". We show that the phase change of the X-rays due to the sample can be uniquely determined from the time-dependent transmitted intensities. The energy response of the sample was reconstructed from the phase and the intensity data with a resolution of 23 $\un{neV}$.

42.87.Bg - Phase shifting interferometry.
76.80.+y - Mössbauer effect; other $\gamma$-ray spectroscopy.
78.70.Ck - X-ray scattering.

© EDP Sciences 2004