TY - JOUR
T1 - The role of symmetry in the theory of inelastic high-energy electron scattering and its application to atomic-resolution core-loss imaging
AU - Dwyer, C.
N1 - Funding Information:
The author thanks Shery L.Y. Chang and the two anonymous referees for their many helpful suggestions which ultimately improved the manuscript. Financial support from the Australian Research Council ( DP110104734 ) is gratefully acknowledged.
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2015/4/1
Y1 - 2015/4/1
N2 - The inelastic scattering of a high-energy electron in a solid constitutes a bipartite quantum system with an intrinsically large number of excitations, posing a considerable challenge for theorists. It is demonstrated how and why the utilization of symmetries, or approximate symmetries, can lead to significant improvements in both the description of the scattering physics and the efficiency of numerical computations. These ideas are explored thoroughly for the case of core-loss excitations, where it is shown that the coupled angular momentum basis leads to dramatic improvements over the bases employed in previous work. The resulting gains in efficiency are demonstrated explicitly for K-, L- and M-shell excitations, including such excitations in the context of atomic-resolution imaging in the scanning transmission electron microscope. The utilization of other symmetries is also discussed. Highlights:
AB - The inelastic scattering of a high-energy electron in a solid constitutes a bipartite quantum system with an intrinsically large number of excitations, posing a considerable challenge for theorists. It is demonstrated how and why the utilization of symmetries, or approximate symmetries, can lead to significant improvements in both the description of the scattering physics and the efficiency of numerical computations. These ideas are explored thoroughly for the case of core-loss excitations, where it is shown that the coupled angular momentum basis leads to dramatic improvements over the bases employed in previous work. The resulting gains in efficiency are demonstrated explicitly for K-, L- and M-shell excitations, including such excitations in the context of atomic-resolution imaging in the scanning transmission electron microscope. The utilization of other symmetries is also discussed. Highlights:
KW - Core-loss scattering
KW - Inelastic scattering
KW - STEM-EELS
KW - Symmetry
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U2 - 10.1016/j.ultramic.2014.11.007
DO - 10.1016/j.ultramic.2014.11.007
M3 - Article
AN - SCOPUS:84925522021
SN - 0304-3991
VL - 151
SP - 68
EP - 77
JO - Ultramicroscopy
JF - Ultramicroscopy
ER -