Patent ID: 8772732

Claim:
A scanning charged particle beam apparatus making use of a charged particle beam, the scanning charged particle beam apparatus comprising: a specimen stage on which a specimen is mounted; an aberration corrector that corrects an aberration of an incoming primary charged particle beam; a deflector that is disposed above the aberration corrector and that deflects the primary charged particle beam; an irradiation optical system that scans the primary charged particle beam over a specimen mounted on the specimen stage; a detector that detects secondary charged particles generated from the specimen by scanning the charged particle beam; a display unit that displays an image from output signals of the detector; and a controller that implements control to measure a chromatic third-order aperture aberration quantity by changing the angle and direction of irradiation of the primary charged particle beam onto the specimen by means of the deflector and by changing an accelerating voltage for the primary charged particle beam by means of the deflector.