A von Hámos spectrometer for diamond anvil cell experiments at the High Energy Density Instrument of the European X-ray Free-Electron Laser

Kaa, J.M.; Konôpková, Z.; Preston, T.R.; Cerantola, V.; Sahle, C.J.; Förster, M.; Albers, C.; Libon, L.; Sakrowski, R.; Wollenweber, L.; Buakor, K.; Dwivedi, A.; Mishchenko, M.; Nakatsutsumi, M.; Plückthun, C.; Schwinkendorf, J.-P.; Spiekermann, G.; Thiering, N.; Petitgirard, S.; Tolan, M.; Wilke, M.; Zastrau, U.; Appel, K.; Sternemann, C.

doi:10.1107/S1600577523003041

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Figure 4
(Top, left) Fe Kβ emission for increasing pulse energies for (Fe_0.5Mg_0.5)O contained in a DAC at 100 GPa and after pressure loss. The difference from an LS reference (bottom, left) is slightly increasing with increasing pulse energies, hence implying an electronic spin-state increase. (Right) The IAD value (squares) and M1 shift (crosses) increase up to 200 µJ, after which it reaches a plateau. This would hint towards a value of average spin-state of S = $[0.30^{+0.08}_{-0.04}]$ . The (Fe_0.5Mg_0.5)O (200) diffraction-peak shift (see Fig. S7) suggests a linear increase of the temperature with rising pulse energy. At the highest pulse energy, the pressure collapsed, and the spin-state switched into a full HS.

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ISSN: 1600-5775

Volume 30| Part 4| July 2023| Pages 822-830

https://doi.org/10.1107/S1600577523003041

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