原文由 大布口袋(taboo) 发表: 1. Condensor aperture 2. Rotation center 4. PPX & PPY 3. Rongchigram (condensor astigmatism and focus)
4. On lattice (fine tune condensor astigmatism and focus)
How to see the Ronchigram in crystalline samples. Usually I would apply plasma cleaning before TEM My sample is Al-Cu alloy and precipitates with Cu layers sperated by Al layers would be expected. I usually find it difficult to center the C2 aperture (smallest size) due to lack view of Ronchigram, Can you give some practical tips for this operation.
Of course HRTEM would also work for the purpose. But the contrast would also depend on defocus value. HAADF-STEM seems much less dependent on defocus and is easier for interpretation.
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