@article{KetenogluSpiekermannHarderetal.2018,
  author    = {Ketenoglu, Didem and Spiekermann, Georg and Harder, Manuel and Oz, Erdinc and Koz, Cevriye and Yagci, Mehmet C. and Yilmaz, Eda and Yin, Zhong and Sahle, Christoph J. and Detlefs, Blanka and Yavas, Hasan},
  title     = {X-ray Raman spectroscopy of lithium-ion battery electrolyte solutions in a flow cell},
  series = {Journal of synchrotron radiation},
  volume    = {25},
  journal   = {Journal of synchrotron radiation},
  publisher = {International Union of Crystallography},
  address   = {Chester},
  issn      = {0909-0495},
  doi       = {10.1107/S1600577518001662},
  pages     = {537 -- 542},
  year      = {2018},
  abstract  = {The effects of varying LiPF6 salt concentration and the presence of lithium bis(oxalate)borate additive on the electronic structure of commonly used lithium-ion battery electrolyte solvents (ethylene carbonate-dimethyl carbonate and propylene carbonate) have been investigated. X-ray Raman scattering spectroscopy (a non-resonant inelastic X-ray scattering method) was utilized together with a closed-circle flow cell. Carbon and oxygen K-edges provide characteristic information on the electronic structure of the electrolyte solutions, which are sensitive to local chemistry. Higher Li+ ion concentration in the solvent manifests itself as a blue-shift of both the pi* feature in the carbon edge and the carbonyl pi* feature in the oxygen edge. While these oxygen K-edge results agree with previous soft X-ray absorption studies on LiBF4 salt concentration in propylene carbonate, carbon K-edge spectra reveal a shift in energy, which can be explained with differing ionic conductivities of the electrolyte solutions.},
  language  = {en}
}
@article{WeisSpiekermannSternemannetal.2018,
  author    = {Weis, Christopher and Spiekermann, Georg and Sternemann, Christian and Harder, Manuel and Vanko, Gyorgy and Cerantola, Valerio and Sahle, Christoph J. and Forov, Yury and Sakrowski, Robin and Kupenko, Ilya and Petitgirard, Sylvain and Yavas, Hasan and Bressler, Christian and Gawelda, Wojciech and Tolan, Metin and Wilke, Max},
  title     = {Combining X-ray K beta(1,3), valence-to-core, and X-ray Raman spectroscopy for studying Earth materials at high pressure and temperature},
  series = {Journal of analytical atomic spectrometry},
  volume    = {34},
  journal   = {Journal of analytical atomic spectrometry},
  number    = {2},
  publisher = {Royal Society of Chemistry},
  address   = {Cambridge},
  issn      = {0267-9477},
  doi       = {10.1039/c8ja00247a},
  pages     = {384 -- 393},
  year      = {2018},
  abstract  = {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.},
  language  = {en}
}