961239.fig.005a
(a)
961239.fig.005b
(b)
Figure 5: (a) Values of field evaporation threshold voltage for 𝑊 (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 𝜅 as a function of the ratio of tip length to end radius. Cone aspect ratio = 1 (opening angle 51.2°).