Effect of Correction of the 3-Fold Astigmatism on HREM Lattice Imaging With Information Below 100 Pm
1999; Oxford University Press; Volume: 5; Issue: S2 Linguagem: Inglês
10.1017/s1431927600017438
ISSN1435-8115
AutoresY. C. Wang, A. G. Fitzgerald, EC Nelson, Chenchen Song, M. A. O’Keefe, Christian Kisielowski,
Tópico(s)Advanced Electron Microscopy Techniques and Applications
ResumoAbstract High resolution electron microscopes with field emission sources opened the possibility to investigate solids on a 100 pm range. Either electron holograpy can be applied or an information limit that may even extend into a region below 100 pm can be exploited to reach this goal [1]. However, lens aberrations such as the three-fold astigmatism often complicate an image interpretation in the 100 pm range or even make it impossible [2]. On the other hand, there is growing need to understand physical processes at a mono-atomic level in order to further develop artificially structured materials such as nano-crystals, ceramic coatings or semiconductors. Commonly, such materials contain light elements like C, N, or O with bond lengths that are shorter than a typical 180 pm point resolution of a high resolution, electron microscope. The carbon-carbon distance of 150 pm is the shortest bond length value in crystalline solids. Moreover, any projection of a diamond lattice along a low index zone axis for lattice imaging leads to a reduced C-C distance.
Referência(s)