We’ve introduced all the essential components of the TEM. Now it’s time to see how the guns, lenses, and detectors are combined to form the microscope. Just as we do for the visible-light microscope (VLM), it’s convenient to divide the TEM up into three components: the illumination system, the objective lens/stage, and the imaging system. The illumination system comprises the gun and the condenser lenses and its role is to take the electrons from the source and transfer them to your specimen. You can operate the illumination system in two principal modes: parallel beam and convergent beam. The first mode is used for TEM imaging and diffraction, while the second is used for scanning (STEM) imaging, microanalysis, and microdiffraction.
KeywordsObjective Lens Parallel Beam Illumination System Stem Image Condenser Lens
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