Development of Fowler-Nordheim theory for a spherical field emitter

被引：41

作者：

Edgcombe, CJ ^{[1
]}

机构：

[1] Univ Cambridge, Dept Phys, Cambridge CB3 0HE, England

来源：

PHYSICAL REVIEW B | 2005年 / 72卷 / 04期

关键词：

D O I：

10.1103/PhysRevB.72.045420

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Fowler-Nordheim (F-N) theory has been extended to use a potential distribution approximating that outside a hemisphere supported on a shank, instead of planar field as widely used hitherto. The extended theory includes an effective angle of emission and a supply factor (relative to free-electron supply) that can be calculated when other parameters are known. If single values of the F-N slope and intercept are available, compatible sets of parameters including emitter radius, surface field, solid angle of emission, and supply factor can be deduced. Specific values can be estimated for these parameters when the change of slope over the experimental range is known with sufficient accuracy.

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