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![[Figure 1]](gy5041fig1mag.jpg)
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Figure 1
Geometry of the dark-field X-ray microscope at ID06-HXM at the ESRF. The incident beam k0 travels along the laboratory xl axis. The optical axis of the objective lens is aligned to the direction of the diffracted beam kd. The pivot point of the goniometer and sample is coincident with the intersection of these two optical axes. Vector Q defines the local scattering vector at a given point r(x, y, z) within the sample, and may be parameterized by the scattering angle 2θ, the azimuthal angle η and the length of the vector |Q|. The value of |Q| is related to the spacing of the lattice plane being measured, dhkl, and the X-ray wavelength, λ, by Bragg's law. The goniometer is associated with a base tilt, μ, an ω-rotation around Q and two tilts, χ and ϕ. d1 is the distance from the sample to the entry point of the objective and d2 is the distance from the exit point of the objective to the detector. The positive directions of the angles are indicated. This figure is adapted from Poulsen et al. (2021  ). |
![[Figure 1]](gy5041fig1.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
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