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Figure 6
Diffractometer and reciprocal-space coordinate systems. The neutron beam is projected from the right-hand side and diffracted neutrons from the crystal at O create a scattering angle of 2θ with the incident beam direction. The reciprocal-lattice point is shown as a red sphere at B and is located on the Ewald sphere surface. Hence, OA = OB = 1/λ. z* = −(OAOBcos2θ) = − {(1/λ) − [(1/λ)cos2θ]} = (1/λ)[(z4/D) − 1]. We can also state that x* = x4/Dλ and y* = y4/Dλ.

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