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Laminar gratings can be used to perform x-ray absorption measurements dispersively in energy, thereby making an efficient use of the available x-ray intensity. To examine the performance of a laminar grating in diffracting short wavelength x rays, efficiency measurements of a 600l∕mm grating were performed over the photon energy range from 3 to 8 keV. A peak efficiency of 5.8% was observed without surface normal rotation (SNR); with a SNR of 60° a maximum efficiency of 14.1% was measured. The measured grating efficiencies are in good qualitative agreement with values calculated by a code based on the Neviere theory. By considering both the peak efficiency and the diffracted bandwidth, a gain of 97 is obtained for the 600l∕mm grating with a SNR of 60° in comparison with a germanium (111) crystal. Sufficient energy resolution for extended x-ray absorption fine structure experiments can be achieved by a grating at short wavelengths.
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Heimann et al. (2005) studied this question.
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