仪器对比
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Whereas flat crystals are used in sequence spectrometers, multichannel spectrometers principally employ
curved crystals.
The curvature of the crystals is selected in such a way that by applying slit optics the X-ray entrance slit is
focused by the curved crystal onto the exit slit. This allows higher intensities in a space-saving geometric
arrangement.
Different types of crystal curvature are used for focusing. The most commonly used are the curvatures
that follow a logarithmic spiral (Fig. 20a) and the Johansson curvature (including grinding) (Fig. 20b).
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