Refinement of the extraction-parameter approach for deriving formal emission area from a Fowler-Nordheim plot

As part of a longer-term project to compare different methods of extracting emission-area data from ideal Fowler-Nordheim plots, this Poster investigates refinements to the extraction-parameter approach. It is shown that varying the choice of the scaled fitting parameter f(t), depending on the range of values used for the independent variable, does make a noticeable difference. However, the (usually neglected) chord correction is much smaller than previously thought; it is justified to continue neglecting it, but better practice is to include it.