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Figure 2
Theoretical temporal coherence envelope for a number of microscope configurations. Solid lines represent cold field emission gun (CFEG) instruments (ΔE = 0.3 eV). Dashed and dashed/dotted lines correspond to Schottky (thermionic) FEG machines (ΔE = 0.7 eV). The CRYO ARM 200 II (pink line) evaluated here is second in optical performance after the top-of-the-line CRYO ARM 300 II and Krios 5.

IUCrJ
Volume 13| Part 4| July 2026|
ISSN: 2052-2525
https://doi.org/10.1107/S2052252526004100