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![[Figure 2]](jo5124fig2mag.jpg)
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Figure 2
Modified Ewald construction to describe second-order scattering events giving rise to DMS lines. Bright cones have their apex at the reciprocal-space origin, while dark cones have their apex at the centre of the Ewald sphere, as shown for reflections Q and Q′. When scattering vectors of first order (S vectors) terminate at S-rings (dark cone–sphere intersections), the resulting second-order scattering is directed along the bright cones. For instance, the S-ring of reflection Q touches an intensity distribution near the reciprocal node of reflection H (arrow 1), defining the wavevector kd = S + k that is re-scattered as kb = Q + kd along the Q bright cone (arrow 2); the kd direction on the bright cone is indicated as a dashed line. |
![[Figure 2]](jo5124fig2.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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