Patent ID: 6717144
Filing Date: 2004-04-06
Classification: H01J

Abstract:
A scanning electron microscope system with an electrostatic magnetic field complex objective lens, comprising at least two or more deflection means for tilting a primary electron beam and for projecting said primary electron beam onto a specimen, wherein a first deflecting means of said deflection means tilts the primary electron beam and a second deflecting means of said deflection means is arranged near said objective lens so as to generate a deflection field and also to serve as a compensation field for compensating abaxial aberration at the same time, and abaxial aberration of the primary electron beam deflected by said first deflecting deflection means is compensated, wherein said first deflecting means deflects the abaxial aberration of said primary electron beam within a range in which (1/2) rBâ€²+(1/2) r&phgr;â€³ is negligible, and said deflection field is râ€²B+râ€²&phgr;â€², where B denotes axial magnetic field distribution of the electrostatic magnetic field complex objective lens, &phgr; is an axial electrostatic potential of said electrostatic magnetic complex objective lens, and r is a distance from an optical axis to an orbit of the primary electron beam.