Abstract
Material properties frequently relate to structures at or near surfaces, particularly in thin films. As a result, it is essential to understand these structures at the molecular and atomistic levels. The most accurate and widely used techniques for characterizing crystallographic order are based on X-ray diffraction. When dealing with thin films or interfaces, standard approaches, such as single crystal or powder diffraction, are not suitable. However, X-ray diffraction under grazing incidence conditions can provide the required information. In this Primer, grazing incidence X-ray diffraction (GIXD) is comprehensively introduced, starting from basic considerations on X-ray diffraction at crystals with reduced dimensionality and the optical properties of X-rays, followed by a more in-depth description of an experimental performance, including X-ray sources, goniometers and detectors. Experimental errors, limitations and reproducibility are discussed. Various applications, from highly ordered inorganic single crystal surfaces to weakly ordered polymer thin films, are presented to illustrate the potential of GIXD. Data visualizations, representations and evaluation strategies are summarized, based on the example of anthracene thin films. The Primer compiles information relevant to perform high-quality GIXD experiments, evaluate data and interpret results, to extend knowledge about X-ray diffraction from surfaces, interfaces and thin films.
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Data availability
Original data and meta data on the grazing incidence X-ray diffraction (GIXD) studies of anthracene thin films are available via the repository of the Graz University of Technology at https://doi.org/10.3217/8rxt9-jy433.
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Acknowledgements
The authors thank beamline XRD1, synchrotron Elettra and Trieste for providing beamtime to perform grazing incidence X-ray diffraction (GIXD) measurements to show different types of anthracene thin films. Argonne National Laboratory’s work was supported by the US Department of Energy, Office of Science, under contract DE-AC02-06CH11357.
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Introduction (R.R.); Experimentation (S.K.); Results (O.W. and F.G.); Applications (Z.J. and J.S.); Reproducibility and data deposition (R.R.); Limitations and optimizations (C.N.); Outlook (C.N.); overview of the Primer (all authors).
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Glossary
- 2D powder
-
(Two-dimensional powder). Crystallites with a defined crystallographic plane parallel to the substrate surface but without any azimuthal or in-plane alignment.
- Angle of grazing incidence
-
(αi). The angle of the primary X-ray beam relative to the sample surface is defined as the angle of incidence.
- Biaxial texture
-
Crystallographic texture where the crystallites are preferably aligned along two different axes, for example, one perpendicular to the surface and one along a defined surface azimuth.
- Bragg rods
-
The crystallographic lattice of two-dimensional crystals is represented by Bragg rods in the reciprocal space.
- Critical angle of total external reflection
-
(αc). At angles of grazing incidence below αc, the primary X-ray beam is totally reflected from an ideally flat substrate surface.
- Crystallographic texture
-
The distribution of crystallites within a sample in respect to their orientation relative to the sample coordinate system.
- Crystal truncation rod
-
(CTR). Cleaving of a crystal results in a crystalline lattice with a missing half. The presence of lattice points on one side and missing lattice points on the other side results in CTRs in reciprocal space.
- Macrostrain
-
External stress causes strain of the crystal lattice detectable by peak shifts.
- Microstrain
-
Structural defects of crystalline lattices cause internal strain, which is associated with peak broadening.
- Mosaicity
-
Average deviation of crystal alignments (or crystal orientations) from a given sample direction.
- Penetration depth
-
(Λ). Total reflection of the primary X-ray beam at the sample surface reduces the penetration into a sample surface to characteristic values in the nanometre range. When the angle of grazing incidence αi is greater than the critical angle of total external reflection αc, penetration is determined by the linear absorption coefficient µ of the sample material.
- Powder plot
-
Integration of the measured intensity across the scattering vector \(\vec{q}\), representing a diffraction pattern of randomly distributed crystallites.
- Refraction correction
-
Only the z part of the scattering vector has to be corrected according to refraction effects; largest corrections are present at αf and/or αi ≈ αc, where αf is the angle between the reflected X-ray beam and the sample surface, αi is the angle of grazing incidence and αc is the critical angle of total external reflection.
- Scattering angles
-
Angles between the primary X-ray beam and the diffracted beam.
- Scattering vector
-
The scattering vector \(\vec{q}\) is the difference between the wavevectors of the primary and the scattered X-ray beam.
- Slit interference function
-
General diffraction condition for gratings with a limited number of repeating units.
- Wave vector
-
The wave vector \(\vec{k}\) gives the direction of the X-ray beam; the length of the vector is related to the wavelength λ (or energy E) of the radiation.
- X-ray diffraction
-
Superposition of coherently (and elastically) scattered X-ray waves according to their phase difference resulting from path length differences between the different scattering centres.
- Yoneda peak
-
The scattered intensity is enhanced when the angle between the reflected X-ray beam and sample surface is close to the critical angle of total external reflection αc.
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Werzer, O., Kowarik, S., Gasser, F. et al. X-ray diffraction under grazing incidence conditions. Nat Rev Methods Primers 4, 15 (2024). https://doi.org/10.1038/s43586-024-00293-8
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DOI: https://doi.org/10.1038/s43586-024-00293-8