  Plane-wave electrons undergo momentum transfer as they scatter off a target
in overlapping spherical waves. The transferred momentum leads to target
structural information to be encoded in angle and energy differential
scattering. For symmetric, periodic or structured targets this can engender
diffraction in the electron intensity both in real (angular) and in momentum
space. With the example of elastic scattering from C60 we show this
simultaneous manifestation of diffraction signatures. The simulated
angle-momentum diffractograms can be imaged in experiments with a
two-dimensional detector and an energy-tunable electron gun. The result may
inspire invention of technology to extend scopes of electron diffraction from
molecules and nanostructures, open a direction of electron crystallography
using the momentum-differential diffraction, and motivate an approach to
control the time delay between the pump laser-pulse and the probe
electron-pulse by tuning the electron impact-speed in ultrafast electron
diffraction experiments.
