Electron diffraction evidence of domain twinning in graphite-bromine single crystals

The in-plane electron diffraction pattern from single crystals of graphite-bromine intercalation compound has been interpreted in terms of a three-fold twinned monoclinic unit cell having in-plane lattice translations $\text{a}\text{=8.87}\text{A}\text{?}$, $\text{b}\text{=4.26}\text{A}\text{?}$, and the angle between them γ=103.9°, commensurate with the graphite lattice. The resulting twinned-domain model has been verified by observation of electron diffraction from individual domains.