Abstract
A horizontal shift in the collector characteristic curves suggests the presence of an electric field of 10 6V/cm or greater within insulating thin film secondary emitters. This assumption is supported by the fact that changes in secondary yield occur corresponding to changes in internal field. Furthermore, effects have been observed which suggest that the structure of insulating films may be an important factor relating to their properties because of the coplanar grid effect. This work was supported by the Wright Air Development Division, Air Research and Development Command, Wright-Patterson Air Force Base, Ohio, under Contract No. AF33(616)-6239.
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