Fig. 4

Sample driven electron probe semi-angle selection. (a) Phase CTF for SSB and (b) simulated phase CTF for ITR (simulated/reconstructed using abTEM) displayed as a function of real space spacing. Notice how the ITR image quality with probe semi-angle of 13.5 mrad benefits from non-zero CTF transfer beyond 2\(\alpha\). SSB (c) and ITR (d) phase images together with their power spectra for various probe semi-angles. Dotted white circles show the 2\(\alpha\) limit. Overlaid graphics demonstrates \(\hbox {SmB}_{6}\) atomic structure (green filled circles B, blue filled circles Sm atoms respectively). Scale bars correspond to 5 Å.