Exit wave reconstruction at atomic resolution

L J Allen; W McBride; N L O'Leary; M P Oxley

doi:10.1016/j.ultramic.2004.01.012

Exit wave reconstruction at atomic resolution

Ultramicroscopy. 2004 Jul;100(1-2):91-104. doi: 10.1016/j.ultramic.2004.01.012.

Authors

L J Allen¹, W McBride, N L O'Leary, M P Oxley

Affiliation

¹ School of Physics, University of Melbourne, Victoria 3010, Australia. lja@physics.unimelb.edu.au

PMID: 15219694
DOI: 10.1016/j.ultramic.2004.01.012

Abstract

An iterative method for exit wave function reconstruction based on wave function propagation in free space is presented. The method, which has the potential for application to many forms of microscopy, has been tailored to work with a through focal series of images measured in a high-resolution transmission electron microscope. Practical difficulties for exit wave reconstruction which are pertinent in this experimental environment are the slight incoherence of the electron beam, sample drift and its effect upon the defocus step size that can be utilised, and the number of image measurements that need to be made. To gauge the effectiveness of the method it is applied to experimental data that has been analysed previously using a maximum likelihood formalism (the MAL method).

Publication types

Comparative Study
Research Support, Non-U.S. Gov't

MeSH terms

Crystallography
Image Processing, Computer-Assisted / methods*
Imaging, Three-Dimensional / methods*
Microscopy, Electron*
Microscopy, Phase-Contrast / methods
Models, Theoretical*
Nanotechnology