  We introduce a number of techniques in quantitative convergent-beam electron
diffraction under development by our group and discuss the basis for measuring
interatomic electrostatic potentials (and therefore also electron densities),
localised at sub-nanometre scales, with sufficient accuracy and precision to
map chemical bonds in and around nanostructures in nanostructured materials.
This has never been possible as experimental measurements of bonding have
always been restricted to homogeneous single-phased crystals.
