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Influence of 2s Bloch wave state excitations on quantitative HAADF STEM imaging

Wouters, C; Markurt, T; Albrecht, M; Rotunno, Enzo; Grillo, Vincenzo


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    <subfield code="a">&lt;p&gt;In this paper the influence of 2s Bloch wave states on high angle annular dark field image contrast is studied&lt;br&gt;
quantitatively by Bloch wave and multislice simulations. We show that 2s states are excited beyond a critical Z&lt;br&gt;
value and cause a long period oscillation of the electron probe wave function that significantly influences the Z&lt;br&gt;
contrast. As a result, we find that the Z contrast for high Z alloys remains thickness dependent up to high sample&lt;br&gt;
thicknesses and this effect has to be considered for compositional analysis. In the special case of ordered alloys,&lt;br&gt;
the impact of 2s excitations on intensity provides a way to quantify long-range order phenomena in alloys with&lt;br&gt;
known composition.&lt;/p&gt;</subfield>
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