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Zeitabhängige Beschreibung thermischer Effekte bei der Streuung von Elektronen an dünnen Festkörperschichten
Art der Abschlussarbeit
Diplomarbeit
Autoren
- Koch, Werner
Abstract
As it has been shown by [1], the coherence length of projectile electrons propagating in Transmission Electron
Microscopes (TEM) is of the same order of magnitude as
the target thickness. Therefore, the modelling of the
processes involved in high resolution microscopy by means
of a plane wave approach seems too crude an approximation.
The purpose of this project is to develop a method to
describe this process by propagating localized electron
wave packets. A comparison of the incorporation of thermal
effects is given between a full ensemble average of
independent simulations in frozen lattice approximation
and the modelling via the Debye-Waller factor.
[1]: Schmid, H. 1985: Fakultaet der Physik, der Eberhard-Karls-Universitaet zu Tuebingen, Diss.
Microscopes (TEM) is of the same order of magnitude as
the target thickness. Therefore, the modelling of the
processes involved in high resolution microscopy by means
of a plane wave approach seems too crude an approximation.
The purpose of this project is to develop a method to
describe this process by propagating localized electron
wave packets. A comparison of the incorporation of thermal
effects is given between a full ensemble average of
independent simulations in frozen lattice approximation
and the modelling via the Debye-Waller factor.
[1]: Schmid, H. 1985: Fakultaet der Physik, der Eberhard-Karls-Universitaet zu Tuebingen, Diss.
Zugeordnete Forschungsschwerpunkte
- Wellenpaketdynamik und Quantenkontrolle
Zugeordnete Forschungsprojekte
- Transmission von Elektronen durch dünne Festkörperschichten
Berichtsjahr
2007