Patent ID: 8299430
Filing Date: 2012-10-30
Classification: H01J

Abstract:
1. An electron microscope comprising: an electron gun configured to generate an electron beam; an accelerator configured to accelerate the electron beam and to apply the electron beam to a sample; a controller configured to control an acceleration energy of the electron beam to be applied to the sample so that a focal position of the electron beam agrees with a depth of a region to be measured of the sample; and a detector configured to detect selectively electrons losing a specific energy corresponding to the depth of the region to be measured of the sample out of the electron beam transmitted through the sample and losing energy due to an interaction with the sample to obtain a transmission image or a diffraction image of the electrons at the depth of the region to be measured of the sample, wherein the controller is configured to control the acceleration energy of the electron beam to be applied to the sample so that energy of the electrons losing the specific energy agrees with a rated acceleration energy.