Patent ID: 7875849
Filing Date: 2011-01-25
Classification: H01J

Abstract:
1. An electron beam apparatus including a sample stage on which a sample is placed, an electron optical system that irradiates the sample with a primary electron beam, and outputs a secondary-particle signal by detecting a secondary particle, and an information processing apparatus that processes the secondary-particle signal, the electron optical system comprising: an immersion objective lens for converging the primary electron beam on the sample; an acceleration electrode in the immersion objective lens for accelerating the secondary particle generated from irradiation of the primary electron beam; an assist electrode for separating a trajectory of a high-velocity component from a trajectory of a low-velocity component in the accelerated secondary particle; a reflecting member having a collision surface for a collision of the secondary particle and generation of an incidental particle; and a plurality of incidental particle detectors arranged in rotationally symmetry with respect to an optical axis of the primary electron beam, for detecting the high-velocity component and low-velocity component contained in the secondary particle independently; wherein the assist electrode is disposed between the acceleration electrode and the incidental particle detectors, wherein the incidental particle detectors are disposed at a side of the reflecting member, wherein a predetermined voltage is applied between the assist electrode and the reflecting member, and whereby adjusting a shadow contrast in an image is based on the secondary particle.