Patent ID: 7244949
Filing Date: 2007-07-17
Classification: B82Y,H01J

Abstract:
1. An electron-optical arrangement providing a primary electron beam path for a beam of primary electrons directed from a primary electron source to an object positionable in an object plane of the arrangement, and a secondary electron beam path for secondary electrons originating from the object, the electron microscopy arrangement comprising a magnet arrangement having: a first magnetic field region traversed by the primary electron beam path and the secondary electron beam path for separating the primary electron beam path and the secondary electron beam path from each other, a second magnetic field region arranged in the primary electron beam path upstream of the first magnetic field region, wherein the second magnetic field region is not traversed by the secondary electron beam path, and wherein the first and second magnetic field regions deflect the primary electron beam path in substantially opposite directions, a third magnetic field region arranged in the secondary electron beam path downstream of the first magnetic field region, wherein the third magnetic field region is not traversed by the first electron beam path, and wherein the first and third magnetic field regions deflect the secondary electron beam path in a substantially same direction.