The 1s-State Analysis Applied to High-Angle, Annular Dark-Field Image Interpretation - When Can We Use It?

Publication Type:
Journal Article
Microscopy and Microanalysis, 2004, 10 (1), pp. 4 - 8
Issue Date:
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A small probe centered on an atomic column excites the bound and unbound states of the two-dimensional projected potential of the column. It has been argued that, even when several states are excited, only the 1s state is sufficiently localized to contribute a signal to the high-angle detector. This article shows that non-1s states do make a significant contribution for certain incident probe profiles. The contribution of the 1s state to the thermal diffuse scattering is calculated directly. Sub-Ångstrom probes formed by Cs-corrected lenses excite predominantly the 1s state and contributions from other states are not very large. For probes of lower resolution when non-1s states are important, the integrated electron intensity at the column provides a better estimate of image intensity.
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