Journal
ULTRAMICROSCOPY
Volume 189, Issue -, Pages 46-53Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2018.03.016
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Funding
- Israel Science Foundation [1310/13]
- German-Israeli Project cooperation (DIP)
- European Research Council under the European Union's Seventh Framework Programme (FP7)/ERC grant [320832]
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Nearly eighty years ago, Scherzer showed that rotationally symmetric, charge-free, static electron lenses are limited by an unavoidable, positive spherical aberration. Following a long struggle, a major breakthrough in the spatial resolution of electron microscopes was reached two decades ago by abandoning the first of these conditions, with the successful development of multipole aberration correctors. Here, we use a refractive silicon nitride thin film to tackle the second of Scherzer's constraints and demonstrate an alternative method for correcting spherical aberration in a scanning transmission electron microscope. We reveal features in Si and Cu samples that cannot be resolved in an uncorrected microscope. Our thin film corrector can be implemented as an immediate low cost upgrade to existing electron microscopes without re-engineering of the electron column or complicated operation protocols and can be extended to the correction of additional aberrations. (C) 2018 The Authors. Published by Elsevier B.V.
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