On the sensitivity of convergent beam low energy electron diffraction patterns to small atomic displacements
نویسندگان
چکیده
منابع مشابه
Convergent beam electron diffraction
In convergent-beam electron diffraction (CBED) a highly convergent electron beam is focussed on to a small (~< 50 nm) area of the sample. Instead of the diffraction spots that are obtained in the back focal plane of the objective lens with parallel illumination in conventional selected-area electron diffraction, CBED produces discs of intensity. The point group can be determined uniquely from t...
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The development of new materials requires an understanding of their mode of growth and the nature of defects, interfaces and strains thereby incorporated. This paper shows how convergent beam electron diffraction (CBED) and large angle CBED (LACBED) can be used to analyse such problems. It is shown how CBED and LACBED can give two-beam rocking curves, which can be used to profile plane rotation...
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We propose the formation of LEED patterns using a highly convergent beam forming a probe of nanometer dimensions. A reflection rocking curve may then be recorded in many diffraction orders simultaneously. Multiple scattering calculations show that the intensity variations within these rocking curves is as sensitive to the parameters describing the surface dipole layer as conventional I/V scans....
متن کاملQuantitative Energy-filtered Convergent Beam Electron Diffraction - Matching Theory to Experiment
Quantitative Convergent Beam Electron Diffraction (CBED) is now established as a means of accurate loworder structure factor determination. Using energy-filtered zone-axis CBED patterns it has been demonstrated that the 111 structure factor at the <110> zone-axis in Si can be measured to better than 0.1%. In order to achieve this accuracy, it is essential to have a full understanding of the zon...
متن کاملDynamical low-energy electron-diffraction investigation of lateral displacements in the topmost layer of Pd(110).
Based on He-atom diffraction evidence for an order-disorder transition on Pd(110) at 230 K, other authors have proposed a model in which the atoms of the topmost layer are displaced laterally by 0.7 Å along the [001] direction, with the directions of the displacements correlated at T<230 >K, but largely uncorrelated at T>230 K. To test this model, we have examined the proposed ordered phase by ...
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ژورنال
عنوان ژورنال: Applied Surface Science
سال: 2019
ISSN: 0169-4332
DOI: 10.1016/j.apsusc.2019.05.274