@article{SchulzLieutenantXiaoetal.2020,
  author    = {Schulz, Christian and Lieutenant, Klaus and Xiao, Jie and Hofmann, Tommy and Wong, Deniz and Habicht, Klaus},
  title     = {Characterization of the soft X-ray spectrometer PEAXIS at BESSY II},
  series = {Journal of synchrotron radiation},
  volume    = {27},
  journal   = {Journal of synchrotron radiation},
  publisher = {International Union of Crystallography},
  address   = {Chester},
  issn      = {1600-5775},
  doi       = {10.1107/S1600577519014887},
  pages     = {238 -- 249},
  year      = {2020},
  abstract  = {The performance of the recently commissioned spectrometer PEAXIS for resonant inelastic soft X-ray scattering (RIXS) and X-ray photoelectron spectroscopy and its hosting beamline U41-PEAXIS at the BESSY II synchrotron are characterized. The beamline provides linearly polarized light from 180 eV to 1600 eV allowing for RIXS measurements in the range 200-1200 eV. The monochromator optics can be operated in different configurations to provide either high flux with up to 10(12) photons s(-1) within the focal spot at the sample or high energy resolution with a full width at half maximum of <40 meV at an incident photon energy of similar to 400 eV. The measured total energy resolution of the RIXS spectrometer is in very good agreement with theoretically predicted values obtained by ray-tracing simulations. PEAXIS features a 5 m-long RIXS spectrometer arm that can be continuously rotated about the sample position by 106 degrees within the horizontal photon scattering plane, thus enabling the study of momentum-transfer-dependent excitations. Selected scientific examples are presented to demonstrate the instrument capabilities, including measurements of excitations in single-crystalline NiO and in liquid acetone employing a fluid cell sample manipulator. Planned upgrades of the beamline and the RIXS spectrometer to further increase the energy resolution to similar to 100 meV at 1000 eV incident photon energy are discussed.},
  language  = {en}
}
@article{SchubertFrischAllardetal.2017,
  author    = {Schubert, Marcel and Frisch, Johannes and Allard, Sybille and Preis, Eduard and Scherf, Ullrich and Koch, Norbert and Neher, Dieter},
  title     = {Tuning side chain and main chain order in a prototypical donor-acceptor copolymer},
  series = {Elementary Processes in Organic Photovoltaics},
  volume    = {272},
  journal   = {Elementary Processes in Organic Photovoltaics},
  publisher = {Springer},
  address   = {Berlin},
  isbn      = {978-3-319-28338-8},
  issn      = {0065-3195},
  doi       = {10.1007/978-3-319-28338-8_10},
  pages     = {243 -- 265},
  year      = {2017},
  abstract  = {The recent development of donor-acceptor copolymers has led to an enormous improvement in the performance of organic solar cells and organic field-effect transistors. Here we describe the synthesis, detailed characterisation, and application of a series of structurally modified copolymers to investigate fundamental structure-property relationships in this class of conjugated polymers. The interplay between chemical structure and optoelectronic properties is investigated. These are further correlated to the charge transport and solar cell performance, which allows us to link their chemical structure to the observed physical properties.},
  language  = {en}
}