Optimized spatial overlap in optical pump–X-ray probe experiments with high repetition rate using laser-induced surface distortions

Reinhardt, M.; Koc, A.; Leitenberger, W.; Gaal, P.; Bargheer, M.

doi:10.1107/S1600577515024443

Journal of Synchrotron Radiation Journal of
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Figure 4
(a) Distortion of the sample surface due to the exciting optical pump beam. The simulation is taken from Navirian et al. (2012

). (b) Scattering geometry of the unexcited sample. The scattering vector $[{\bf{q}}_{\rm{sc}}]$ is parallel to the Q_z-axis. (c) The rising slope of the near-surface distortion of the sample leads to a decrease of α_i. The scattering vector $[{\bf{q}}_{\rm{sc}}]$ is now composed of a positive q_z- and a negative q_x-component. (d) In the center of the excitation spot the sample is almost homogeneously excited in the lateral direction. The center of the CTR is shifted to smaller Q_z-values due to thermal expansion of the lattice. The scattering vector $[{\bf{q}}_{\rm{sc}}]$ is again parallel to the Q_z-axis, i.e. q_x = 0. (e) Similar to (c); however, the falling slope leads to an increased diffraction angle α_i. The scattering vector is now composed of a positive q_z and a positive q_x-component. The decomposition of the scattering vector $[{\bf{q}}_{\rm{sc}}]$ into a q_z- and a q_x-component is shown.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 23| Part 2| March 2016| Pages 474-479

doi:10.1107/S1600577515024443

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