Patent ID: 6703612
Filing Date: 2004-03-09
Classification: H01J

Abstract:
A charged particle spectrometer comprising:a. concentric substantially hemispherical electrodes for analyzing energies of charged particles; b. a curved entrance collimator arranged to define the field of view of the spectrometer, said entrance collimator a substantially arcuate slit having a center of curvature coinciding substantially with a spherical center of said concentric hemispherical electrodes, with said slit lying substantially on a circle whose radius is substantially midway between said coaxial hemispherical electrodes; c. a curved entrance aperture spaced from the entrance collimator and arranged to admit the charged particles into the spectrometer said entrance aperture a substantially arcuate slit whose center of curvature coincides substantially with the spherical center of said concentric hemispherical electrodes, with the slit lying substantially on a circle whose radius is substantially midway between said coaxial hemispherical electrodes; and d. a detector for detecting the charged particles admitted through the entrance aperture; wherein said analyzer, entrance collimator, entrance aperture, and detector are arranged to provide a large solid angle of acceptance.