DOES ELECTRON HOLOGRAPHY ENERGY-FILTER

The contribution of inelastic scattering to off-axis electron hologram s is considered. For a sample which introduces a single sharp energy l oss delta E, we find that this loss contributes time-independent inter ference fringes to the hologram provided delta E < Delta E, where Delt a E is the electron source energy spread. The relevance of this to two -beam lattice imaging at the Bragg condition is outlined, and the rela tionship between the uncertainty principle, the Van Cittert-Zernike th eorem and the phase-space interpretation of coherence and Brightness r eviewed.