Simulation of spatially resolved electron energy loss near-edge structure for scanning transmission electron microscopy.
Aberration-corrected scanning transmission electron microscopy yields probe-position-dependent energy-loss near-edge structure (ELNES) measurements, potentially providing spatial mapping of the underlying electronic states. ELNES calculations, however, typically describe excitations by a plane wave traveling in vacuum, neglecting the interaction of the electron probe with the local electronic environment as it propagates through the specimen. Here, we report a methodology that combines a full electronic-structure calculation with propagation of a focused beam in a thin film. The results demonstrate that only a detailed calculation using this approach can provide quantitative agreement with observed variations in probe-position-dependent ELNES.
Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA.
M P
MP
Prange
M P
MP
Oxley
M
M
Varela
S J
SJ
Pennycook
S T
ST
Pantelides