Precession Electron Diffraction Using a Digital Sampling Method
2010 (English)In: Ultramicroscopy, ISSN 0304-3991, E-ISSN 1879-2723, Vol. 211, no 1, 47-55 p.Article in journal (Refereed) Published
A software-based method for collecting precession electron diffraction (PED) patterns isdescribed. The PED patterns are obtained on a computer controlled transmission electronmicroscope. A series of electron diffraction (ED) patterns are collected as still ED frames atequal intervals while the electron beam is precessed by one period (360°) around the opticalaxis. A PED pattern is obtained by combining the different ED frames, which resembles thesampling of a conventional PED pattern. Since intermediate ED frames are collected, it ispossible to perform different post-processing strategies on the ED data. This can be used forgeometric corrections to obtain accurate integrated intensities. The alignments and datacollection are fully automated and controlled by software. The data quality is comparable towhat can be achieved using specialized hardware for precession. The PED data can be usedfor structure solution and refinement with reasonably good R-values.
Place, publisher, year, edition, pages
Elsevier B.V. , 2010. Vol. 211, no 1, 47-55 p.
Precession electron diffraction; crystallography; data processing; crystal structure; TEM control; Lorentz correction
IdentifiersURN: urn:nbn:se:su:diva-39241DOI: 10.1016/j.ultramic.2010.09.008OAI: oai:DiVA.org:su-39241DiVA: diva2:319144