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- W2022148033 abstract "Abstract A simple parameterization is presented for the elastic electron scattering cross sections from single atoms into the annular dark-field (ADF) detector of a scanning transmission electron microscope (STEM). The dependence on atomic number, Z , and inner reciprocal radius of the annular detector, q 0 , of the cross section σ( Z , q 0 ) is expressed by the empirical relation where A ( q 0 ) is the cross section for hydrogen ( Z = 1), and the detector is assumed to have a large outer reciprocal radius. Using electron elastic scattering factors determined from relativistic Hartree-Fock simulations of the atomic electron charge density, values of the exponent n ( Z , q 0 ) are tabulated as a function of Z and q 0 , for STEM probe sizes of 1.0 and 2.0 Å. Comparison with recently published experimental data for single-atom scattering [Krivanek et al. (2010). Nature 464 , 571–574] suggests that experimentally measured exponent values are systematically lower than the values predicted for elastic scattering from low- Z atoms. It is proposed that this discrepancy arises from the inelastic scattering contribution to the ADF signal. A simple expression is proposed that corrects the exponent n ( Z , q 0 ) for inelastic scattering into the annular detector." @default.
- W2022148033 created "2016-06-24" @default.
- W2022148033 creator A5065771474 @default.
- W2022148033 date "2011-11-04" @default.
- W2022148033 modified "2023-10-02" @default.
- W2022148033 title "<i>Z</i>Dependence of Electron Scattering by Single Atoms into Annular Dark-Field Detectors" @default.
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- W2022148033 doi "https://doi.org/10.1017/s1431927611012074" @default.
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