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Figure 2
Schematic of IXS analyzer geometries using diced crystal analyzers. (I) Positioned along a vertical Rowland circle with single-element detector (including detector offset with focusing on-Rowland: broken square). (II) (a) Rowland geometry with a PSD, (b) focal point on the Rowland circle but detector off the circle. (III) Focusing on-Rowland but detector in front of focal point. (IV) Focusing off-Rowland with a single-element detector, demagnification contribution causes chromatic aberration. (V) Detector offset with PSD; energy–position correspondence in (II) is broken in (V). (VI) Temperature gradient of the analyzer crystal (Tmin < T0 < Tmax); temperature correction reduces chromatic aberration and allows off-Rowland geometry to be used. Colored lines indicate dispersed energy for clarity, e.g. the different color of the rays are focused on the center of the detector in case (V), while one color of the rays are focused on the same position in case (VI).

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