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arXiv · 1801.05869

Wave-packet numerical investigation of thermal diffuse scattering: A time-dependent quantum approach to the Debye method

S. Rudinsky·A. S. Sanz·R. Gauvin
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Abstract

The effects of thermal diffuse scattering on the transmission and eventual diffraction of highly accelerated electrons are investigated with a method that incorporates the frozen phonon approximation to the exact numerical solution of the time-dependent Schr\"odinger equation. Unlike other methods in the related literature, in this approach the attenuation of diffraction features arises in a natural way by averaging over a number of wave-packet realizations, thus avoiding any additional experimentally obtained Debye-Waller factors or artificial modulations. Without loss of generality, the method has been applied to analyze the transmission of an electron beam through a thin Al film in two dimensions, making use of Einstein's model to determine the phonon configuration for each realization at a given temperature. It is shown that, as temperature and hence atomic vibration amplitudes increase, incoherence among different electron wave-function realizations gradually increases, blurring the well-defined diffraction features characterizing the zero-temperature intensity.

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S. Rudinsky, A. S. Sanz, R. Gauvin. 2018-01-17. Wave-packet numerical investigation of thermal diffuse scattering: A time-dependent quantum approach to the Debye method. https://arxiv.org/abs/1801.05869

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