Analytic expression for electron emission code

Carefully reviewed the C# code today for the analytic expressions for TFE and extended Schottky regimes of electron emission, and transcribed it back to paper.  This is the first step in eliminating any doubt in my mind that these are the correct expressions.  The next step is to write down all the math and approximations that takes us from first principles to these equations, so that it is completely clear.

By the way, the code expressions  seem to match exactly the TED and J expressions found in references – the only issue is units.   When I figure out the units correctly, I believe I can run the C# TED expression without any normalization, which will show more clearly why the analytic and numerical expressions deviate from one another.

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