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Ring counting in field‐ion micrographs
Author(s) -
Webber R. D.,
Walls J. M.,
Smith R.
Publication year - 1978
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1978.tb00107.x
Subject(s) - ring (chemistry) , micrograph , projection (relational algebra) , plane (geometry) , magnification , field (mathematics) , ion , optics , physics , geometry , mathematics , chemistry , algorithm , diffraction , organic chemistry , pure mathematics , quantum mechanics
SUMMARY Ring counting is an important technique in the quantitative analysis of field‐ion micrographs since the information derived is independent of magnification and projection both of which vary in a complex way over the image. However, although the technique is important, its direct use has previously been restricted to the region within which the particular ring system is discernible. In this paper, techniques and procedures are described which usefully extend the range over which the ring count can be performed. The methods are based on determining the numerical interrelationship of the various ring structures. This not only allows ring counting to be effected over large angular distances, but also enables counts to be performed in any direction so that the number of rings of a high‐index plane can be determined through more prominent low‐index regions.