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Updated: Feb 10, 2026

Preparing a Celadonite Electron Source and Estimating Its Brightness
Published on: November 5, 2019
Electron Source Brightness and Illumination Semi-Angle Distribution Measurement in a Transmission Electron Microscope
Felix Börrnert1, Julian Renner1, Ute Kaiser1
1Materialwissenschaftliche Elektronenmikroskopie,Universität Ulm,Albert-Einstein-Allee 11,89081 Ulm,Germany.
Abstract:
The electron source brightness is an important parameter of an electron microscope. Reliable and easy brightness measurement routes are not easily found. A determination method for the illumination semi-angle distribution in transmission electron microscopy is even less well documented. Herein, we report a facile measurement route for both entities and demonstrate it on a state-of-the-art instrument. The reduced axial brightness of the FEI X-FEG with a monochromator was determined to be larger than 108 A/(m2 sr V).
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