Výsledky vyhledávání - "ALLEN, L. J."

Report

A method for virtual optical sectioning and tomography utilizing shallow depth of field

Autor: Gureyev, T. E., Quiney, H. M., Allen, L. J.

A method is proposed for high-resolution, three-dimensional reconstruction of internal structure of objects from planar transmission images. The described approach can be used with any form of radiation or matter waves, in principle, provided that th

Externí odkaz: http://arxiv.org/abs/2202.02692

Zobrazit plný text záznamu

Report

Relative roles of multiple scattering and Fresnel diffraction in the imaging of small molecules using electrons, Part II: Differential Holographic Tomography

Autor: Gureyev, T. E., Quiney, H. M., Kozlov, A., Paganin, D. M., Schmalz, G., Allen, L. J.

Publikováno v: Ultramicroscopy Volume 230, 113311 (2021)

It has been argued that in atomic-resolution transmission electron microscopy (TEM) of sparse weakly scattering structures, such as small biological molecules, multiple electron scattering usually has only a small effect, while the in-molecule Fresne

Externí odkaz: http://arxiv.org/abs/2012.07012

Zobrazit plný text záznamu

Report

On electron imaging of small molecules, Part I: relative roles of multiple scattering and Fresnel diffraction

Autor: Gureyev, T. E., Quiney, H. M., Kozlov, A., Allen, L. J.

The relative roles of multiple electron scattering and in-molecule free-space propagation in transmission electron microscopy of small molecules are discussed. It is argued that while multiple scattering tends to have only a moderate effect in this c

Externí odkaz: http://arxiv.org/abs/1911.11599

Zobrazit plný text záznamu

Report

On electron imaging of small molecules, Part II: tomographic reconstruction from defocus series

Autor: Gureyev, T. E., Quiney, H. M., Kozlov, A., Allen, L. J.

A practical method utilising three-dimensional image pattern matching is proposed which, in principle, is capable of unambiguous determination of the types and positions of atoms in small molecules from defocus series collected at only a few differen

Externí odkaz: http://arxiv.org/abs/1911.11598

Zobrazit plný text záznamu

Report

Spectroscopic imaging of single atoms within a bulk solid

Autor: Varela, M., Findlay, S. D., Lupini, A. R., Christen, H. M., Borisevich, A. Y., Dellby, N., Krivanek, O. L., Nellist, P. D., Oxley, M. P., Allen, L. J., Pennycook, S. J.

The ability to localize, identify and measure the electronic environment of individual atoms will provide fundamental insights into many issues in materials science, physics and nanotechnology. We demonstrate, using an aberration-corrected scanning t

Externí odkaz: http://arxiv.org/abs/cond-mat/0401156

Zobrazit plný text záznamu