Five lattice images of aluminium taken from a crystal aligned with a [0 0 1] zone axis parallel to the incident electron beam are given in Figure 4.54. Each image is recorded with a different...

Five lattice images of aluminium taken from a crystal aligned with a [0 0 1] zone axis parallel to the incident electron beam are given in Figure 4.54. Each image is recorded with a different objective lens defocus value that is indicated in the CTF. In the first image the positions of the atoms in a unit cell are marked.

(a) Identify the planes (220) and (200) on the images.

(b) Given that the lattice parameter of aluminium is 0.405 nm, determine the image magnification.

 (c) Explain why the contrast at the positions of the atoms changes from white to black across the defocus series.