HIGH RESOLUTION, HIGH ETENDUE, RETARDING-POTENTIAL ELECTRON CONCENTRATOR

摘要

The invention comprises improvements in an electron-concentractor device of the spherical-grid, retarding-potential, post-monochromator spectrometer type. A pair of fine-mesh, high-transparency, spaced, planar grids is added after the first curved coarse focusing grid thereby determining the lower-energy limit of the electron passband. A second oppositely curved coarse focusing grid is added after the planar grids to provide assistance in focusing the passband electrons on the collector lens.