Electron emission microscope for use in electron emission sites observations

An electron emission microscope EEM.constructed for electron emission sites observations is presented. This EEM consists of three unipotential lenses, a microchannel plate, and a phosphor screen, and has the advantage that it enables the observation of electron emission sites of not only a sharp point cathode, such as a field emitter, but also a broad area cathode surface. Experimental results obtained are as follows: 1. the operation of this EEM was confirmed by observing photoelectron emission sites irradiated with ultraviolet light, and 2. field emission sites in broad area Al and Cu could be observed. q1999 Published by Elsevier Science B.V. All rights reserved