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Proceedings Paper

Moessbauer-Fresnel zone plate as nuclear monochromator
Author(s): Timothy M. Mooney; Ercan E. Alp; Wenbing Yun
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Paper Abstract

Zone plates currently used in x-ray optics derive their focusing power from (a spatial variation of) the electronic refractive index--that is, from the collective effect of electronic x-ray- scattering amplitudes. Nuclei also scatter x rays, and resonant nuclear-scattering amplitudes, particularly those associated with Mossbauer fluorescence, can dominate the refractive index for x rays whose energies are very near the nuclear-resonance energy. A zone plate whose Fresnel zones are filled alternately with 57Fe and 56Fe (57Fe has a nuclear resonance of natural width (Gamma) equals 4.8 nano-eV at 14.413 keV; 56Fe has no such resonance) has a resonant focusing efficiency; it focuses only those x rays whose energies are within several (Gamma) of resonance. When followed by an absorbing screen with a small pin- hole, such a zone plate can function as a synchrotron-radiation monochromator with an energy resolution of a few parts of 1012. The energy-dependent focusing efficiency and the resulting time-dependent response of a resonant zone plate are discussed.

Paper Details

Date Published: 20 January 1993
PDF: 7 pages
Proc. SPIE 1740, Optics for High-Brightness Synchrotron Radiation Beamlines, (20 January 1993); doi: 10.1117/12.138707
Show Author Affiliations
Timothy M. Mooney, Argonne National Lab. (United States)
Ercan E. Alp, Argonne National Lab. (United States)
Wenbing Yun, Argonne National Lab. (United States)

Published in SPIE Proceedings Vol. 1740:
Optics for High-Brightness Synchrotron Radiation Beamlines
John R. Arthur, Editor(s)

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