Solving non-centrosymmetric two-dimensional crystal structures by dynamic electron diffraction.
Despite the fast increase in expertise developed in the field of electron crystallography, dynamic scattering effects still remain a severe obstacle in this field, a hurdle that is being circumvented rather than fully tackled. In this paper, a new way of straightforward interpretation of conventional many-beam zone-axis dynamical electron diffraction patterns is presented that helps to solve the phase problem for non-centrosymmetric two-dimensional crystal structures, in particular if these contain only a few heavier atoms. While the implementation of this method is easiest for fairly weak multiple scattering, its extension to arbitrarily strong dynamical effects is mentioned. A method to obtain high-resolution diffraction data in the presence of specimen bending is proposed.
Koch
Christoph T
CT
Max Planck Institut für Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart, Germany. koch@mf.mpg.de