title: A novel quantum dynamical approach in electron microscopy combining wave-packet propagation with Bohmian trajectories.
abstract: The numerical analysis of the diffraction features rendered by transmission electron microscopy typically relies either on classical approximations (Monte Carlo simulations) or quantum paraxial tomography (the multislice method and any of its variants). Although numerically advantageous (relatively simple implementations and low computational costs), they involve important approximations and thus their range of applicability is limited. To overcome such limitations, an alternative, more general approach is proposed, based on an optimal combination of wave-packet propagation with the on-the-fly computation of associated Bohmian trajectories. For the sake of clarity, but without a loss of generality, the approach is used to analyze the diffraction of an electron beam by a thin aluminum slab as a function of three different incidence (working) conditions which are of interest in electron microscopy: the probe width, the tilting angle, and the beam energy. Specifically, it is shown that, because there is a dependence on particular thresholds of the beam energy, this approach provides a clear description of the diffraction process at any energy, revealing at the same time any diversion of the beam inside the material towards directions that cannot be accounted for by other conventional methods, which is of much interest when dealing with relatively low energies and/or relatively large tilting angles.
authors.affiliation: Department of Mining and Materials Engineering, McGill University, 3610 University Street, Montreal, Québec H3A 0C5, Canada.
authors.forename: S
authors.initials: S
authors.lastname: Rudinsky
authors.affiliation: Department of Optics, Faculty of Physical Science, Universidad Complutense de Madrid, Pza. Ciencias 1, 28040 Madrid, Spain.
authors.forename: A S
authors.identifier: 0000000186175976
authors.initials: AS
authors.lastname: Sanz
authors.affiliation: Department of Mining and Materials Engineering, McGill University, 3610 University Street, Montreal, Québec H3A 0C5, Canada.
authors.forename: R
authors.initials: R
authors.lastname: Gauvin