Optimization of exit-plane waves restored from HRTEM through-focal series

Ultramicroscopy
Rolf ErniPhilip N H Nakashima

Abstract

Atomic-resolution transmission electron microscopy has largely benefited from the implementation of aberration correctors in the imaging part of the microscope. Though the dominant geometrical axial aberrations can in principle be corrected or suitably adjusted, the impact of higher-order aberrations, which are mainly due to the implementation of non-round electron optical elements, on the imaging process remains unclear. Based on a semi-empirical criterion, we analyze the impact of residual aperture aberrations on the quality of exit-plane waves that are retrieved from through-focal series recorded using an aberration-corrected and monochromated instrument which was operated at 300kV and enabled for an information transfer of approximately 0.05nm. We show that the impact of some of the higher-order aberrations in retrieved exit-plane waves can be balanced by a suitable adjustment of symmetry equivalent lower-order aberrations. We find that proper compensation and correction of 1st and 2nd order aberrations is critical, and that the required accuracy is difficult to achieve. This results in an apparent insensitivity towards residual higher-order aberrations. We also investigate the influence of the detector characteristics on t...Continue Reading

References

Dec 31, 2002·Ultramicroscopy·P N H Nakashima, A W S Johnson
Mar 28, 2009·Science·Caglar O GiritA Zettl

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Citations

Dec 25, 2015·Acta Crystallographica. Section A, Foundations and Advances·Earl J Kirkland
Aug 26, 2014·Micron : the International Research and Review Journal for Microscopy·C KisielowskiR Cieslinski

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