WikiSysop: Created page with "== Citation == Angert, I., Majorovits, E. and Schröder, R.R. 2000. Zero-loss image formation and modified contrast transfer theory in EFTEM. Ultramicroscopy. 81, 3-4 (2000), 203–222. == Abstract == For a weak phase/weak amplitude object the information transfer in the imaging process of TEM is described by the common formalism of the contrast transfer function (CTF). So far the e!ects of inelastic scattering were not accounted for in this formalism. In conventional..."

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Created page with "== Citation == Angert, I., Majorovits, E. and Schröder, R.R. 2000. Zero-loss image formation and modified contrast transfer theory in EFTEM. Ultramicroscopy. 81, 3-4 (2000), 203–222. == Abstract == For a weak phase/weak amplitude object the information transfer in the imaging process of TEM is described by the common formalism of the contrast transfer function (CTF). So far the e!ects of inelastic scattering were not accounted for in this formalism. In conventional..."

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== Citation ==

Angert, I., Majorovits, E. and Schröder, R.R. 2000. Zero-loss image formation and modified contrast transfer theory in EFTEM. Ultramicroscopy. 81, 3-4 (2000), 203–222.

== Abstract ==

For a weak phase/weak amplitude object the information transfer in the imaging process of TEM is described by the
common formalism of the contrast transfer function (CTF). So far the e!ects of inelastic scattering were not accounted for
in this formalism. In conventional imaging they were simply neglected. In energy "lteringTEM (EFTEM), where removal
of inelastic electrons leads to higher specimen contrast, they were modelled by a global increase of the elastic amplitude
contrast. Thus, the description of inelastic and elastic scattering was mixed. Here a new ansatz is proposed which treats
elastic and inelastic contrast transfer separately by adding an inelastic contribution to the scattering potentials. In
EFTEM this has the e!ect of adding a "lter contrast which depends on the characteristics of the inelastic scattering. For
samples with dominant plasmon loss the additional "lter contrast is restricted to low resolution. Because of its strong
dependence on the nature of the inelastic scattering process, the "lter contrast cannot in general be uni"ed with the
conventional elastic amplitude contrast.
The modi"ed CTF theory for EFTEM was tested experimentally on a variety of samples. Images of amorphous layers
of copper, aluminium, and carbon "lms, as well as zero-loss images of proteins embedded in amorphous ice were
evaluated. The values of the parameters of the additional "lter contrast were determined for carbon "lm and proteins
embedded in vitri"ed ice. Comparison of di!erent CTF models used to reconstruct 3D volumes from zero-loss images
con"rmed that best agreement with the atomic model is attained with the new, modi"ed CTF theory.

== Keywords ==

== Links ==

https://www.sciencedirect.com/science/article/pii/S0304399199001904

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== Comments ==

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