Information Limit

The presence of the "virtual aperture" created by the damping envelopes imposes a resolution limit on the microscope: information limit.


  • Information limit goes well beyond point resolution limit for FEG microscopes (due to high spatial and temporal coherency).

  • For the microscopes with thermionic electron sources (LaB6 and W), the info limit usually coincides with the point resolution.

  • Phase contrast images are directly interpretable only up to the point resolution (Scherzer resolution limit).

  • If the information limit is beyond the point resolution limit, one needs to use image simulation software to interpret any detail beyond point resolution limit.