@article{SchickShaydukBojahretal.2013,
  author    = {Schick, Daniel and Shayduk, Roman and Bojahr, Andre and Herzog, Marc and von Korff Schmising, Clemens and Gaal, Peter and Bargheer, Matias},
  title     = {Ultrafast reciprocal-space mapping with a convergent beam},
  series = {JOURNAL OF APPLIED CRYSTALLOGRAPHY},
  volume    = {46},
  journal   = {JOURNAL OF APPLIED CRYSTALLOGRAPHY},
  number    = {10},
  publisher = {WILEY-BLACKWELL},
  address   = {HOBOKEN},
  issn      = {0021-8898},
  doi       = {10.1107/S0021889813020013},
  pages     = {1372 -- 1377},
  year      = {2013},
  abstract  = {A diffractometer setup is presented, based on a laser-driven plasma X-ray source for reciprocal-space mapping with femtosecond temporal resolution. In order to map out the reciprocal space, an X-ray optic with a convergent beam is used with an X-ray area detector to detect symmetrically and asymmetrically diffracted X-ray photons simultaneously. The setup is particularly suited for measuring thin films or imperfect bulk samples with broad rocking curves. For quasi-perfect crystalline samples with insignificant in-plane Bragg peak broadening, the measured reciprocal-space maps can be corrected for the known resolution function of the diffractometer in order to achieve high-resolution rocking curves with improved data quality. In this case, the resolution of the diffractometer is not limited by the convergence of the incoming X-ray beam but is solely determined by its energy bandwidth.},
  language  = {en}
}
@article{ShaydukHerzogBojahretal.2013,
  author    = {Shayduk, Roman and Herzog, Marc and Bojahr, Andre and Schick, Daniel and Gaal, Peter and Leitenberger, Wolfram and Navirian, Hengameh and Sander, Mathias and Goldshteyn, Jevgenij and Vrejoiu, Ionela and Bargheer, Matias},
  title     = {Direct time-domain sampling of subterahertz coherent acoustic phonon spectra in SrTiO3 using ultrafast x-ray diffraction},
  series = {Physical review : B, Condensed matter and materials physics},
  volume    = {87},
  journal   = {Physical review : B, Condensed matter and materials physics},
  number    = {18},
  publisher = {American Physical Society},
  address   = {College Park},
  issn      = {1098-0121},
  doi       = {10.1103/PhysRevB.87.184301},
  pages     = {7},
  year      = {2013},
  abstract  = {We synthesize sub-THz longitudinal quasimonochromatic acoustic phonons in a SrTiO3 single crystal using a SrRuO3/SrTiO3 superlattice as an optical-acoustic transducer. The generated acoustic phonon spectrum is determined using ultrafast x-ray diffraction. The analysis of the generated phonon spectrum in the time domain reveals a k-vector dependent phonon lifetime. It is observed that even at sub-THz frequencies the phonon lifetime agrees with the 1/omega(2) power law known from Akhiezer's model for hyper sound attenuation. The observed shift of the synthesized spectrum to the higher q is discussed in the framework of nonlinear effects appearing due to the high amplitude of the synthesized phonons.},
  language  = {en}
}