The diffraction of a beam of electrons by atoms or
molecules. Electrons can be diffracted in a similar
way to light and X-rays shows that particle can act
Because of the low penetration, electron
diffraction cannot easily be used to investigate crystal
structure. It is employed to measure bond lengths
and angles of molecules in gases. It is extensively
used in the study of solid surfaces and absorption.
The main techniques are low-energy electron diffraction
(LEED) in which the electron beam is reflected onto
a fluorescent screen, and high-energy electron-diffraction
(HEED) used either with reflection or transmission
in investigating thin films.