Patent ID: 6407387
Filing Date: 2002-06-18
Classification: H01J

Abstract:
Particle beam apparatus witha source (1) for generating a primary particle beam (2), means (3) for focussing the primary particle beam onto a specimen (4), means (5) for detecting backscattered and/or secondary electrons (6) released at the specimen (4), said detecting means being located between said source (1) and said focussing means (3), means (7) to accelerate the primary particle beam (2) from a first energy to a second higher energy and means (8) to decelerate the primary particle beam (2) to a final beam energy, characterized in that there are providedfirst additional means (9) to decelerate the primary particle beam (2) shortly before the detecting means (5) and second additional means (10) to accelerate the primary particle beam (2) immediately after the detecting means (5).