Electron microscopy
Projector Lens Alignment (PLA)
- Practical Electron Microscopy and Database -
- An Online Book -
Microanalysis | EM Book                                                                                   https://www.globalsino.com/EM/        

This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.


To enhance EELS signal, the electron beam should be aligned by placing the Ronchigram (with a STEM-objective aperture) in the center of the GIF camera with Projector Lens Alignment (PLA) knob. This step is normally achieved by “VIEW” in DigitalMicrograph interface (see Figure 3326).

Ronchigram centering with PLA   Ronchigram centering with PLA   Ronchigram centering with PLA

Figure 3326. (a) and (b) Ronchigram is not in the center of the GIF camera; (c) Ronchigram is in the center of the GIF camera.



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