Moessbauer-Fresnel zone plate as nuclear monochromator

Timothy M. Mooney; Ercan E. Alp; Wenbing Yun

doi:10.1117/12.138707

20 January 1993 Moessbauer-Fresnel zone plate as nuclear monochromator

Timothy M. Mooney, Ercan E. Alp, Wenbing Yun

Proceedings Volume 1740, Optics for High-Brightness Synchrotron Radiation Beamlines; (1993) https://doi.org/10.1117/12.138707
Event: San Diego '92, 1992, San Diego, CA, United States

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.

Citation Download Citation

Timothy M. Mooney, Ercan E. Alp, and Wenbing Yun "Moessbauer-Fresnel zone plate as nuclear monochromator", Proc. SPIE 1740, Optics for High-Brightness Synchrotron Radiation Beamlines, (20 January 1993); https://doi.org/10.1117/12.138707

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KEYWORDS

Zone plates

Monochromators

Refractive index

Synchrotron radiation

X-rays

Scattering

Energy efficiency

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