961239.fig.006a
(a)
961239.fig.006b
(b)
961239.fig.006c
(c)
Figure 6: (a, b) Schematic FIM images of 110-oriented hemispherical 𝑊 tip (radius 8 nm) subjected to field evaporation (image-force model without polarization component) at 77 K, single-atom and double tip; (c) experimental image of polycrystalline 𝑊 tip (apex circled) imaged at 77 K, 8.0 kV.