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Figure 17
Performance comparisons between the von Hamos spectrometer with eight Si(111) Bragg crystals and the single Si(333) Laue crystal and between the Si(333) and SiO2(330) analyzers. (a) Kα1, and (b) and (c) Kβ1,3 spectra from a Nb foil. The background in each data set was kept here to provide a realistic performance comparison, and the background-subtracted spectra are shown in the inset of (c). To carefully compare the efficiency at the Kβ energy, a larger beam size (∼40 µm), i.e. worse energy resolution for the Laue analyzer, was used to prevent sample damage, as acquiring the Kβ signal takes longer compared with the Kα signal. The inset of (b) shows the full spectra measured using the von Hamos spectrometer, where Kα and Kβ lines are collected by (888) and (999) reflections, respectively. |