TY  - JOUR
A1  - Weis, Christopher
A1  - Spiekermann, Georg
A1  - Sternemann, Christian
A1  - Harder, Manuel
A1  - Vanko, Gyorgy
A1  - Cerantola, Valerio
A1  - Sahle, Christoph J.
A1  - Forov, Yury
A1  - Sakrowski, Robin
A1  - Kupenko, Ilya
A1  - Petitgirard, Sylvain
A1  - Yavas, Hasan
A1  - Bressler, Christian
A1  - Gawelda, Wojciech
A1  - Tolan, Metin
A1  - Wilke, Max
T1  - Combining X-ray K beta(1,3), valence-to-core, and X-ray Raman spectroscopy for studying Earth materials at high pressure and temperature
BT  - the case of siderite
JF  - Journal of analytical atomic spectrometry
N2  - X-ray emission and X-ray Raman scattering spectroscopy are powerful tools to investigate the local electronic and atomic structure of high and low Z elements in situ. Notably, these methods can be applied for in situ spectroscopy at high pressure and high temperature using resistively or laser-heated diamond anvil cells in order to achieve thermodynamic conditions which appear in the Earth's interior. We present a setup for combined X-ray emission and X-ray Raman scattering studies at beamline P01 of PETRA III using a portable wavelength-dispersive von Hamos spectrometer together with the permanently installed multiple-analyzer Johann-type spectrometer. The capabilities of this setup are exemplified by investigating the iron spin crossover of siderite FeCO3 up to 49.3 GPa by measuring the Fe M2,3-edge and the Fe Kβ1,3 emission line simultaneously. With this setup, the Fe valence-to-core emission can be detected together with the Kβ1,3 emission line providing complementary information on the sample's electronic structure. By implementing a laser-heating device, we demonstrate the strength of using a von Hamos type spectrometer for spin state mapping at extreme conditions. Finally, we give different examples of low Z elements' absorption edges relevant for application in geoscience that are accessible with the Johann-type XRS spectrometer. With this setup new insights into the spin transition and compression mechanisms of Earth's mantle materials can be obtained of importance for comprehension of the macroscopic physical and chemical properties of the Earth's interior.
Y1  - 2018
U6  - https://doi.org/10.1039/c8ja00247a
SN  - 0267-9477
SN  - 1364-5544
VL  - 34
IS  - 2
SP  - 384
EP  - 393
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  -