Abstract
The principle of operation of a 63° “energy focussing” electron monochromator is described. Both elelctron trajectory simulations and a mathematical theory, are used to assess the practicability of the device for ionization efficiency measurements. This novel device uses essentially the same electrode configuration as the conventional 127° cylindrical sector monochromator. In the “energy focussing” monochromator the initial thermal energy distribution of the electrons is modified, by accelerating slow electrons and retarding fast electrons. This little appreciated property of the cylindrical sector monochromator occurs halfway between the entrance and exit slits. In conventional operation the electrons are spatially dispersed according to their energy and those outside a narrow energy range are rejected. This does not efficiently use the available electron current and space charge limits resolution. The “energy focussing” monochromator can in principle avoid these problems. An order of magnitude improvement in useable electron current is predicted by theory.
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