Which mechanism limits electron beam spatial coherence in transmission electron microscope (TEM) with aberration-corrected objective lenses?

💡 Explanation

When electrons scatter within the sample, transfer of orbital angular momentum (OAM) to electrons causes them to occupy mixed angular momentum states. This reduces spatial coherence in the sample plane, leading to blurred features. Therefore, OAM transfer is key, rather than chromatic aberration, spherical aberration (corrected), or the diffraction limit.

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