Abstract: A photocathode electron projector is formed with a sample attached to an anode and a patterned quartz mask attached to a cathode. The quartz mask is patterned with Au—Pd layers that emit electrons when illuminated by ultraviolet light. The ultraviolet light is filtered to just above the work function of the Au—Pd material. This has the effect of causing substantially monochromatic electrons to be emitted. The electrons are brought under influence of a parallel electric and magnetic field to thereby undergo a cyclotronic orbit. An integer number of cyclotronic orbits insures that the electrons hit the sample substantially at the same location as they were on mask.