 | Acta Crystallographica Section A Acta Crystallographica Section A FOUNDATIONS AND ADVANCES |
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![[Figure 3]](ae5046fig3mag.jpg)
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Figure 3
(a) The Bragg condition, where all the scattering from all the positions on both planes is in phase, so any pairing of a scattering point from one plane with any point on another plane will be in phase. (b) When the scattering planes are rotated away from the Bragg angle a point P0 cannot scatter in phase with any point Q at the specular scattering angle 2θs. (c) For the same incident angle and the same specular scattering angle the near-phase relationship holds across the plane for P0, P1 etc. (d) However, if we move the detector to a different 2θ, P0 and P1 no longer scatter perfectly in phase and similarly the phase relationship associated with P and Q points will change. The phase relationship between the scattering from P and Q points can therefore be varied by moving the detector. If there is a detector position where the path length difference is λ then all the planes will scatter in phase, with a maximum value defined by the phase sum of the amplitudes of points P0, P1 etc. |
![[Figure 3]](ae5046fig3.jpg)
| FOUNDATIONS ADVANCES |
ISSN: 2053-2733
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