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are the same as are the magnitudes of the wave-vectors |k_in| = |k_out|. From the time that the photon is scattered at r until it is absorbed at r_screen, the photon undergoes a change in phase
:

The net radiation arriving at r_screen is the sum of all the scattered waves throughout the crystal
: which may be written as a Fourier transform
: where g = k_out - k_in is a reciprocal lattice

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