Patent ID: 8334508

Claim:
An apparatus for forming an energy-filtered image from an unfiltered image in an electron microscope, the apparatus comprising: an energy-dispersive device that bends the high-energy component of the electron beam scattered by a specimen at less of an angle in comparison to the bending angle of the low-energy component of the electron beam, such that the higher and lower energy electron beam components exit said energy-dispersive device at different angles of trajectory; an electron mirror configured to reflect the electron beam, wherein electrons entering at an angle with respect to the normal to the reflection plane of said mirror exit the mirror symmetrically with respect to said normal and at the same angle; a first plurality of electron lenses configured to converge all energy components of the electron beam exiting said energy-dispersive device at different angles of trajectory at the electron mirror reflection plane; a movable knife-edge plate positioned between the energy-dispersive device and the electron mirror which removes all electrons with energies higher and lower than a selected energy; and a second plurality of electron lenses configured to transport the energy-filtered electron beam to an electron detector.