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Edvin Lundgren. Portrait.

Edvin Lundgren

Professor

Edvin Lundgren. Portrait.

High-energy x-ray diffraction from surfaces and nanoparticles

Author

  • U. Hejral
  • P. Müller
  • M. Shipilin
  • J. Gustafson
  • D. Franz
  • R. Shayduk
  • U. Rütt
  • C. Zhang
  • L. R. Merte
  • E. Lundgren
  • V. Vonk
  • A. Stierle
Show all

Summary, in English

High-energy surface-sensitive x-ray diffraction (HESXRD) is a powerful high-energy photon technique (E > 70 keV) that has in recent years proven to allow a fast data acquisition for the 3D structure determination of surfaces and nanoparticles under in situ and operando conditions. The use of a large-area detector facilitates the direct collection of nearly distortion-free diffraction patterns over a wide q range, including crystal truncation rods perpendicular to the surface and large-area reciprocal space maps from epitaxial nanoparticles, which is not possible in the conventional low-photon energy approach (E=10-20keV). Here, we present a comprehensive mathematical approach, explaining the working principle of HESXRD for both single-crystal surfaces and epitaxial nanostructures on single-crystal supports. The angular calculations used in conventional crystal truncation rod measurements at low-photon energies are adopted for the high-photon-energy regime, illustrating why and to which extent large reciprocal-space areas can be probed in stationary geometry with fixed sample rotation. We discuss how imperfections such as mosaicity and finite domain size aid in sampling a substantial part of reciprocal space without the need of rotating the sample. An exact account is given of the area probed in reciprocal space using such a stationary mode, which is essential for in situ or operando time-resolved experiments on surfaces and nanostructures.

Department/s

  • Synchrotron Radiation Research
  • MAX IV Laboratory

Publishing year

2017-11-27

Language

English

Publication/Series

Physical Review B

Volume

96

Issue

19

Document type

Journal article

Publisher

American Physical Society

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)

Status

Published

ISBN/ISSN/Other

  • ISSN: 2469-9950