SECONDARY ELECTRON EMMISSION FROM SPECIALLY PREPARED TARGETS.
Scientific rept. no. 1,
WASHINGTON UNIV ST LOUIS MO
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The research involved a basically new technique, that of using frozen gases at 77K temperature boiling nitrogen as semi-conducting surfaces. Surfaces of frozen xenon and of frozen carbon dioxide were formed on an underlying conductor. Thickness estimated to range from 25 atomic layers to 20,000 layers were produced. Under impact of a primary electron beam a surface charge developed on the film. The size of the charge could be controlled by the potential of a surrounding collector electrode. The apparent conductivity of the xenon film was considerably greater than that of the carbon dioxide film, an observation which seems to show the relative ease with which electrons can pass through the respective films. It was not found possible to cause a charge to reside on the film surface for a protracted period.