Patent ID: 8466416
Filing Date: 2013-06-18
Classification: H01J

Abstract:
1. An electron detecting mechanism comprising: a plate having an opening located on an optical axis of a primary beam accelerated and released from a charged particle beam source, the opening permitting passage of the primary beam; first and second scintillating surfaces formed on opposite sides of the plate, the first scintillating surface facing a sample; an energy filter located between the charged particle beam source and the plate and having an opening permitting passage of the primary beam, the second scintillating surface facing the energy filter; a first light detector; and a second light detector; wherein, when the primary beam hits the sample, electrons are produced from the sample and some of them impinge as first electrons on the first scintillating surface to thereby produce first scintillation light detected by the first light detector and, at the same time, some of the electrons produced from the sample pass through the opening in the plate, are repelled by the energy filter, and impinge as second electrons on the second scintillating surface to thereby produce second scintillation light detected by the second light detector.