Patent ID: 8866102
Filing Date: 2014-10-21
Classification: H01J

Abstract:
1. An electron beam device, comprising: a beam emitter for emitting a primary electron beam; an objective electron lens for focusing the primary electron beam onto a specimen, wherein the objective lens defines an optical axis; a beam tilting arrangement configured for directing the primary electron beam to the electron lens at an adjustable offset from the optical axis such that the objective electron lens directs the electron beam to strike the specimen at an adjustable oblique beam landing angle, whereby a chromatic aberration is caused; a beam separator having a transverse deflection field orthogonal to the optical axis and a first dispersion for separating a signal electron beam from the primary electron beam; and a dispersion compensation element adapted for adjusting a compensation dispersion of the primary electron beam such as to compensate a beam aberration resulting from the first dispersion and from the chromatic aberration, wherein the beam separator is a purely magnetic deflector which includes a magnetic element as the only deflecting element.