Patent ID: 6946657

Claim:
An electron microscopy system for inspecting an object positionable in an object plane, comprising: a beam splitter for separating a beam path of a primary electron beam from a beam path of a secondary electron beam, an electron source for generating the primary electron beam, and an objective lens disposed in the beam path of the primary electron beam downstream of the beam splitter for guiding the primary electron beam to the object plane and for guiding secondary electrons emanating from a region around the object plane towards the beam splitter, the secondary electrons forming the secondary electron beam, wherein at least one of at least one beam deflector and at least one quadrupole lens is disposed in the beam path of the secondary electron beam downstream of the beam splitter, and wherein the electron microscopy system further comprises and energy adjusting apparatus for adjusting a kinetic energy of the electrons of the secondary electron beam entering the beam splitter, and a controller for controlling the energy adjusting apparatus, wherein the controller further controls said at least one of the at least one beam deflector and the at least one quadrupole lens in dependence of the adjusted energy.