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A multi-crystal wavelength dispersive x-ray spectrometer
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematic view of a vertical cut of the Von Hamos geometry with a crystal analyzer and a position-sensitive detector (PSD). Scattering of a point source beam is analyzed at different energies resulting in an energy-dispersive spectrum on the PSD (left). The instrument showing the array of crystal analyzers (right, photo by M. Beardsley).

Image of FIG. 2.
FIG. 2.

(Top) Energy vs detector pixel position in the dispersive direction, the inset shows the elastic peak images corresponding to the filled line points. (Bottom) Energy resolution vs emission energy of the spectrometer with and without the contribution of the beamline monochromator for the Mn Kβ1,3 spectral range. Values were obtained from the elastic peaks around the Mn Kβ energy with 16 Si(440) analyzers.

Image of FIG. 3.
FIG. 3.

(Top) Image of Mn2O3 emission with all the crystals focused on one line (a) and with columns 1-2 and 3-4 focused in different lines (b). Mn Kβ1,3 peak from Mn2O3 collected by the 4 columns of the spectrometer individually.

Image of FIG. 4.
FIG. 4.

Mn Kβ1,3 spectra of MnIVO2 and MnIIO. Integration time 100 s. A second spectrum from MnIIO collected by means of an scanning spectrometer is also shown for comparison.

Image of FIG. 5.
FIG. 5.

Mn Kβ1,3 spectra of Mn in PS II solution (0.8 mM Mn concentration). Integration time 30 min. Note that the spectrum is that of fully photoreduced Mn in PSII.

Image of FIG. 6.
FIG. 6.

Mn Kβ2,5 spectrum of MnIVO2 with an integration time of 30 min.

Image of FIG. 7.
FIG. 7.

Fe Kβ1,3 spectra from FeIIO and Fe2 IIIO3 with an integration time of 25 s.

Image of FIG. 8.
FIG. 8.

C K-edge XRS spectrum of HOPG. Integration time was 30 min.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A multi-crystal wavelength dispersive x-ray spectrometer