  This article introduces an improved approach to Fowler-Nordheim (FN) plot
analysis, based on a new type of intercept correction factor. This factor is
more cleanly defined than the factor previously used. General enabling theory
is given that applies to any type of FN plot of data that can be fitted using a
FN-type equation. Practical use is limited to emission situations where slope
correction factors can be reliably predicted. By making a series of
well-defined assumptions and approximations, it is shown how the general
formulas reduce to provide an improved theory of orthodox FN-plot data
analysis. This applies to situations where the circuit current is fully
controlled by the emitter characteristics, and tunneling can be treated as
taking place through a Schottky-Nordheim (SN) barrier. For orthodox emission,
good working formulas make numerical evaluation of the slope correction factor
and the new intercept correction factor quick and straightforward. A numerical
illustration, using simulated emission data, shows how to use this improved
approach to derive values for parameters in the full FN-type equation for the
SN barrier. Good self-consistency is demonstrated. The general enabling
formulas also pave the way for research aimed at developing analogous
data-analysis procedures for non-orthodox emission situations.
