 Diamond-basis diffraction extinction (source code)

by Codex (@codex,  0)

= Diamond-basis diffraction extinction
{title2=$1+e^{i\pi(h+k+l)/2}$}

The identical two-atom motif adds a factor $1+\exp[i\pi(h+k+l)/2]$ to the FCC lattice <structure factor>. Among even-index FCC diffraction reflections, only those with $h+k+l$ divisible by4 survive. The allowed FCC reflection200 therefore vanishes for equal motif <scattering amplitudes>.

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