Journal
JOURNAL OF ELECTRON MICROSCOPY
Volume 58, Issue 6, Pages 341-347Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jmicro/dfp033
Keywords
six-fold astigmatism; aberration correction; Ronchigram; trajectory; delta
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Funding
- Japan Science and Technology Agency (JST)
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A new concept of a spherical aberration correction system using three dodecapoles is proposed. The system compensates for higher order aberration of 6-fold astigmatism, which generally limits a uniform phase area for image forming and probe forming in an electron microscope with a conventional two-hexapole corrector. Triple 3-fold astigmatism field is used to correct the spherical aberration of the objective lens, and the total 3-fold astigmatism is eliminated by their combination. The optimum azimuth relationship among three dodecapoles is calculated to eliminate the 6-fold astigmatism. The principle of the method was verified using a mathematically complex representation. This new concept was experimentally tested with a scanning transmission electron microscope at 60 kV acceleration. The 6-fold astigmatism was certainly compensated and the coherent convergent angle became almost twice compared to a conventional double hexapole system.
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