Zobrazeno 1 - 10
of 195
pro vyhledávání: '"Quiney, H. M."'
Radiative corrections to electronic structure are characterized by perturbative expansions in $\alpha$ and $Z\alpha$, where $\alpha$ is the fine-structure constant and $Z$ is the nuclear charge. A formulation of the leading-order $\alpha(Z\alpha)$ Ue
Externí odkaz:
http://arxiv.org/abs/2405.11262
We outline a general formalism for treating vacuum polarization phenomena within an effective field expansion. The coupling between source charges and virtual fields is examined from the perspectives of electrostatic potentials, induced charge densit
Externí odkaz:
http://arxiv.org/abs/2405.11261
Autor:
Gureyev, T. E., Hall, C., Arhatari, B., Pelliccia, D., Aminzadeh, A., Pavlov, K. M., Quiney, H. M.
Publikováno v:
Optics Express, vol.32, no.11, pp.19294-19307, 2024
Young double-slit experiments using monochromatic hard X-rays with the energy of 25 keV are presented. The experiments were performed at a synchrotron source with a distance of 110 m between the interferometer and the detector to produce an interfere
Externí odkaz:
http://arxiv.org/abs/2402.07377
Signal-to-noise ratio and spatial resolution are quantitatively analysed in the context of in-line (propagation based) X-ray phase-contrast imaging. It is known that free-space propagation of a coherent X-ray beam from the imaged object to the detect
Externí odkaz:
http://arxiv.org/abs/2312.11506
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
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
Autor:
Gureyev, T. E., Paganin, D. M., Arhatari, B., Taba, S. T., Lewis, S., Brennan, P. C., Quiney, H. M.
Publikováno v:
Physics in Medicine & Biology 65 215029 (2020)
A method for extracting the dark-field signal in propagation-based phase-contrast imaging is proposed. In the case of objects consisting predominantly of a single material, or several different materials with similar ratios of the real decrement to t
Externí odkaz:
http://arxiv.org/abs/2003.12248
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
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
Publikováno v:
Phys. Rev. A 97, 053819 (2018)
A generic computational imaging setup is considered which assumes sequential illumination of a semi-transparent object by an arbitrary set of structured illumination patterns. For each incident illumination pattern, all transmitted light is collected
Externí odkaz:
http://arxiv.org/abs/1801.01979