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On the benefit of the negative-spherical-aberration imaging technique for quantitative HRTEM
- Source :
-
Ultramicroscopy . Apr2010, Vol. 110 Issue 5, p500-505. 6p. - Publication Year :
- 2010
-
Abstract
- Abstract: Employing an aberration corrector in a high-resolution transmission electron microscope, the spherical aberration C S can be tuned to negative values, resulting in a novel imaging technique, which is called the negative C S imaging (NCSI) technique. The image contrast obtained with the NCSI technique is compared quantitatively with the image contrast formed with the traditional positive C S imaging (PCSI) technique. For the case of thin objects negative C S images are superior to positive C S images concerning the magnitude of the obtained contrast, which is due to constructive rather than destructive superposition of fundamental contrast contributions. As a consequence, the image signal obtained with a negative spherical aberration is significantly more robust against noise caused by amorphous surface layers, resulting in a measurement precision of atomic positions which is by a factor of 2–3 better at an identical noise level. The quantitative comparison of the two alternative C S-corrected imaging modes shows that the NCSI mode yields significantly more precise results in quantitative high-resolution transmission electron microscopy of thin objects than the traditional PCSI mode. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 03043991
- Volume :
- 110
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Ultramicroscopy
- Publication Type :
- Academic Journal
- Accession number :
- 49856283
- Full Text :
- https://doi.org/10.1016/j.ultramic.2009.10.006