Les J. Allen

Optimizing Experimental Conditions for Accurate Quantitative Energy-Dispersive X-ray Analysis of Interfaces at the Atomic Scale

Katherine E MacArthur, Andrew B Yankovich, Armand Beche, Martina Luysberg, Hamish G Brown, Scott D Findlay, Marc Heggen, Leslie J Allen

Journal article  |  2021  |  MICROSCOPY AND MICROANALYSIS

The invention of silicon drift detectors has resulted in an unprecedented improvement in detection efficiency for energy-dispersiv..

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

TE Gureyev, HM Quiney, A Kozlov, DM Paganin, G Schmalz, HG Brown, LJ Allen

Journal article  |  2021  |  Ultramicroscopy

It has been argued that in atomic-resolution transmission electron microscopy (TEM) of sparse weakly scattering structures, such a..

Contrast reversal in atomic-scale phonon spectroscopic imaging

FS Hage, QM Ramasse, LJ Allen

Journal article  |  2020  |  PHYSICAL REVIEW B

It was recently shown that phonon spectral mapping of atomic structure is possible in scanning transmission electron microscopy. T..

Inelastic Scattering in Electron Backscatter Diffraction and Electron Channeling Contrast Imaging

Budhika G Mendis, Juri Barthel, Scott D Findlay, Leslie J Allen

Journal article  |  2020  |  MICROSCOPY AND MICROANALYSIS

Electron backscatter diffraction (EBSD) and electron channeling contrast imaging (ECCI) are used to extract crystallographic infor..

Relative roles of multiple scattering and Fresnel diffraction in the imaging of small molecules using electrons

TE Gureyev, HM Quiney, A Kozlov, LJ Allen

Journal article  |  2020  |  ULTRAMICROSCOPY

The relative roles of multiple electron scattering and in-molecule Fresnel diffraction in atomic-resolution transmission electron ..

Angular dependence of fast-electron scattering from materials

Juri Barthel, Mauricio Cattaneo, Budhika G Mendis, Scott D Findlay, Leslie J Allen

Journal article  |  2020  |  PHYSICAL REVIEW B

Angular resolved scanning transmission electron microscopy is an important tool for investigating the properties of materials. How..

Multi-modal and multi-scale non-local means method to analyze spectroscopic datasets

Niklas Mevenkamp, Katherine E MacArthur, Vasiliki Tileli, Philipp Ebert, Leslie J Allen, Benjamin Berkels, Martial Duchamp

Journal article  |  2020  |  ULTRAMICROSCOPY

A multi-modal and multi-scale non-local means (M3S-NLM) method is proposed to extract atomically resolved spectroscopic maps from ..

Large angle illumination enabling accurate structure reconstruction from thick samples in scanning transmission electron microscopy

HG Brown, R Ishikawa, G S'anchez-Santolino, N Shibata, Y Ikuhara, LJ Allen, SD Findlay

Journal article  |  2019  |  ULTRAMICROSCOPY

Most reconstructions of the electrostatic potential of a specimen at atomic resolution assume a thin and weakly scattering sample,..

Phonon Spectroscopy at Atomic Resolution

FS Hage, DM Kepaptsoglou, QM Ramasse, LJ Allen

Journal article  |  2019  |  PHYSICAL REVIEW LETTERS

Advances in source monochromation in transmission electron microscopy have opened up new possibilities for investigations of conde..

Structure Retrieval at Atomic Resolution in the Presence of Multiple Scattering of the Electron Probe

HG Brown, Z Chen, M Weyland, C Ophus, J Ciston, LJ Allen, SD Findlay

Journal article  |  2018  |  PHYSICAL REVIEW LETTERS

The projected electrostatic potential of a thick crystal is reconstructed at atomic resolution from experimental scanning transmis..