20 January 1993 Moessbauer-Fresnel zone plate as nuclear monochromator
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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.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Timothy M. Mooney, Timothy M. Mooney, Ercan E. Alp, Ercan E. Alp, Wenbing Yun, Wenbing Yun, } "Moessbauer-Fresnel zone plate as nuclear monochromator", Proc. SPIE 1740, Optics for High-Brightness Synchrotron Radiation Beamlines, (20 January 1993); doi: 10.1117/12.138707; https://doi.org/10.1117/12.138707
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