Patent ID: 6384412
Filing Date: 2002-05-07
Classification: H01J

Abstract:
An electron microscope defining an electron beam path to a detector plane, the electron microscope comprising:an imaging magnetic energy filter including a plurality of magnetic deflecting systems arranged symmetrically to a center plane (M) and a plurality of hexapoles arranged between said magnetic deflecting systems; a projection system disposed along said electron beam path downstream of said energy filter; said energy filter defining a dispersion plane (DA) and an achromatic image plane (BA); a control unit operatively connected to said projection system for switching over said projection system for selectively imaging said dispersion plane (DA) and said achromatic image plane (BA) into said detector plane; and, said control unit also being operatively connected to said hexapoles for changing the excitation of at least some of said hexapoles at the same time as the switchover of said projection system.