Modelling of Atomic Imaging and Evaporation in the Field Ion Microscope
Figure 5
(a) Values of field evaporation threshold voltage for (110) tips consisting of a hemisphere on top of a conical shank for different shank and hemisphere sizes (b) effective values of field reduction factor as a function of the ratio of tip length to end radius. Cone aspect ratio = 1 (opening angle 51.2°).