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A seven-crystal Johann-type hard x-ray spectrometer at the Stanford Synchrotron Radiation Lightsource
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic representation of the overlapping Rowland circles concept. Seven spherically bent crystal analyzers are aligned on the same sample-detector axis.

Image of FIG. 2.
FIG. 2.

Spectrometer's mechanical drawing.

Image of FIG. 3.
FIG. 3.

Schematic representation of the relative translations (δ, δ , δ ) of motors , , for two different photon energies ν and ν; the analyzer is maintained on the exact Rowland circle (shown with dotted lines).

Image of FIG. 4.
FIG. 4.

Seven elastic scattering scans at 6489.58 eV (Bragg angle ∼84.26°) for each of spectrometer's crystal positions. The response is identical. (Note: to compensate the polarization of the incident radiation and thus the strong angular dependence of the scattering intensity, the elastic scans for the various spectrometer positions have been normalized to their integrated area for comparison purposes.)

Image of FIG. 5.
FIG. 5.

Elastic peaks along an extended energy range of the spectrometer covered using diced-and-bent Si(440) cut.

Image of FIG. 6.
FIG. 6.

Experimental full width at half maximum (FWHM) of the elastic scattering peaks with the diced-and-bent Si(440). Data for 5 mm and 1 mm slits in front of the SDD detector are shown. Also, a representative value for a conventional bent analyzer (non-diced) of 100 mm diameter is given with and without masking its outermost 25 mm along the dispersive direction.

Image of FIG. 7.
FIG. 7.

Energy ranges for the current SSRL's crystal collection ( Si(110), Si(111), Si(211), Si(620), Si(551), Si(1020), Si(553), Ge(110), Ge(111), Ge(211), and Ge(620)) accounting their various high order allowed reflections. These energies can be analyzed within the 74°–88° scanning angular range of the spectrometer. Some exemplary emission lines and absorption edges are also indicated.

Image of FIG. 8.
FIG. 8.

Kβ x-ray emission from various polycrystalline manganese compounds (MnO, MnO, MnO). The inset figure shows the K-valence emission pattern. Spectra have been normalized to the integrated area of the Kβ main lines.

Image of FIG. 9.
FIG. 9.

A RIXS contour map of FeO along the pre-edge of Fe (left). Comparison of a HERFD-XAS and conventional fluorescence XAS spectrum using a solid state detector integrating the Fe-Kα line (right).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A seven-crystal Johann-type hard x-ray spectrometer at the Stanford Synchrotron Radiation Lightsource