NASA NTRS · 19720000171
Annular objective apertures improve resolution of electron microscopes
Abstract
Hollow-cone illumination techniques, using an annular objective aperture located behind back focal plane of objective lens, increase image contrast and minimize chromatic aberrations.
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Heinemann, K., Poppa, H. R.. 1972-01-01. Annular objective apertures improve resolution of electron microscopes. https://ntrs.nasa.gov/citations/19720000171
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