Figure 1
Schematic representation of the situation in reciprocal space for asymmetric Bragg-case diffraction. After the rotation of P1P2 about the axis o parallel with a surface by an angle β, this line will intersect the sphere SpH at a point Pβ which will be the starting point of the diffracted wave vectors for general asymmetric Bragg-case diffraction. Pβ is above the plane of the drawing and its projection onto this plane coincides with P2. |