Atomic bonding effects in annular dark field scanning transmission electron microscopy. II. Experiments

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Abstract

Quantitatively calibrated annular dark field scanning transmission electron microscopy (ADF-STEM) imaging experiments were compared to frozen phonon multislice simulations adapted to include chemical bonding effects. Having carefully matched simulation parameters to experimental conditions, a depth-dependent bonding effect was observed for high-angle ADF-STEM imaging of aluminum nitride. This result is explained by computational predictions, systematically examined in the preceding portion of this study, showing the propagation of the converged STEM beam to be highly sensitive to net interatomic charge transfer. Thus, although uncertainties in experimental conditions and simulation accuracy remain, the computationally predicted experimental bonding effect withstands the experimental testing reported here.

Original languageEnglish (US)
Article number041603
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume34
Issue number4
DOIs
StatePublished - Jul 1 2016

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© 2016 American Vacuum Society.

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