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Annular objective apertures improve resolution of electron microscopesHollow-cone illumination techniques, using an annular objective aperture located behind back focal plane of objective lens, increase image contrast and minimize chromatic aberrations.
Document ID
19720000171
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Heinemann, K.
Poppa, H. R.
Date Acquired
August 6, 2013
Publication Date
January 1, 1972
Subject Category
Physical Sciences
Report/Patent Number
ARC-10448
Report Number: ARC-10448
Accession Number
72B10171
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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