Patent ID: 8866103
Filing Date: 2014-10-21
Classification: H01J

Abstract:
1. A charged particle energy analyser for simultaneous detection of charged particles within a range of energies, the analyser comprising: inner and outer cylindrically symmetric electrodes arranged coaxially on a longitudinal axis, the inner cylindrically symmetric electrode having a circumference of radius R biasing means for supplying voltage to the inner and outer cylindrically symmetric electrodes to create an electrostatic focussing field between the electrodes, a charged particle source for introducing charged particles into the electrostatic focussing field for analysis, and a detector for detecting charged particles focussed by the electrostatic focussing field, wherein the detector has a flat, charged particle-receiving detection surface parallel to the longitudinal axis and located off-axis, at a radial spacing from the longitudinal axis less than said radius R