Accurate lattice parameters from 3D electron diffraction data. I. Optical distortions.

ABSTRACT: Determination of lattice parameters from 3D electron diffraction (3D ED) data measured in a transmission electron microscope is hampered by a number of effects that seriously limit the achievable accuracy. The distortion of the diffraction patterns by the optical elements of the microscope is often the most severe problem. A thorough analysis of a number of experimental datasets shows that, in addition to the well known distortions, namely barrel-pincushion, spiral and elliptical, an additional distortion, dubbed parabolic, may be observed in the data. In precession electron diffraction data, the parabolic distortion leads to excitation-error-dependent shift and splitting of reflections. All distortions except for the elliptical distortion can be determined together with lattice parameters

SUBMITTER: Brazda P 

PROVIDER: S-EPMC9634609 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature