Electron interference: mystery and reality.

Interference of electron waves has developed from a fascinating phenomenon in basic physics to a key method for the highly sophisticated investigation of both electric and magnetic structures in solid-state materials. After more than 20 years of development, electron holography in the transmission electron microscope is now a very powerful technique for the analysis of micro-fields down to atomic dimensions. The applications extend from highly sensitive measurements in semiconductor technology to the quantitative characterization of atomic structures.