Open Access

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2017-09-20
10:18
OpenAccess [FZJ-2017-06648] Journal Article
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Quantitative Agreement between Electron-Optical Phase Images of WSe 2 and Simulations Based on Electrostatic Potentials that Include Bonding Effects
ddc:550
The quantitative analysis of electron-optical phase images recorded using off-axis electron holography often relies on the use of computer simulations of electron propagation through a sample. However, simulations that make use of the independent atom approximation are known to overestimate experimental phase shifts by approximately 10%, as they neglect bonding effects. [...]
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2017-09-19
16:06
OpenAccess [FZJ-2017-06641] Journal Article
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Intercomparison of AIRS and HIRDLS stratospheric gravity wave observations
ddc:550
We investigate stratospheric gravity wave observations by the Atmospheric InfraRed Sounder (AIRS) aboard NASA's Aqua satellite and the High Resolution Dynamics Limb Sounder (HIRDLS) aboard NASA's Aura satellite. AIRS operational temperature retrievals are typically not used for studies of gravity waves, because their horizontal resolution is rather limited. [...]
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2017-09-19
15:13
OpenAccess [FZJ-2017-06636] Journal Article
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Measuring the orbital angular momentum spectrum of an electron beam
ddc:500
Electron waves that carry orbital angular momentum (OAM) are characterized by a quantized and unbounded magnetic dipole moment parallel to their propagation direction. When interacting with magnetic materials, the wavefunctions of such electrons are inherently modified [...]
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2017-09-19
15:11
OpenAccess [FZJ-2017-06635] Journal Article
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An in-plane magnetic chiral dichroism approach for measurement of intrinsic magnetic signals using transmitted electrons
ddc:500
Electron energy-loss magnetic chiral dichroism is a powerful technique that allows the local magnetic properties of materials to be measured quantitatively with close-to-atomic spatial resolution and element specificity in the transmission electron microscope. Until now, the technique has been restricted to measurements of the magnetic circular dichroism signal in the electron beam direction. [...]
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2017-09-19
15:08
OpenAccess [FZJ-2017-06633] Journal Article
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Prospects for quantitative and time-resolved double and continuous exposure off-axis electron holography
ddc:570
The technique of double exposure electron holography, which is based on the superposition of two off-axis electron holograms, was originally introduced before the availability of digital image processing to allow differences between electron-optical phases encoded in two electron holograms to be visualised directly without the need for holographic reconstruction. Here, we review the original method and show how it can now be extended to permit quantitative studies of phase shifts that oscillate in time. [...]
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2017-09-19
15:04
OpenAccess [FZJ-2017-06632] Journal Article
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Quantitative measurement of mean inner potential and specimen thickness from high-Resolution off-axis electron holograms of ultrathin layered WSe2
ddc:570
The phase and amplitude of the electron wavefunction that has passed through ultra-thin flakes of WSe2 is measured from high-resolution off-axis electron holograms. Both the experimental measurements and corresponding computer simulations are used to show that, as a result of dynamical diffraction, the spatially averaged phase does not increase linearly with specimen thickness close to an [001] zone axis orientation even when the specimen has a thickness of only a few layers. [...]
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2017-09-19
14:59
OpenAccess [FZJ-2017-06631] Journal Article
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Single crystalline superstructured stable single domain magnetite nanoparticles
ddc:000
Magnetite nanoparticles exhibit magnetic properties that are size and organization dependent and, for applications that rely on their magnetic state, they usually have to be monodisperse. Forming such particles, however, has remained a challenge. [...]
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2017-09-19
14:57
OpenAccess [FZJ-2017-06630] Journal Article
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Superoscillating electron wave functions with subdiffraction spots
ddc:530
Almost one and a half centuries ago, Abbe [Arch. Mikrosk. [...]
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2017-09-19
14:06
OpenAccess [FZJ-2017-06626] Journal Article
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Enhancing the optoelectronic properties of amorphous zinc tin oxide by subgap defect passivation: A theoretical and experimental demonstration
ddc:530
The link between sub-bandgap states and optoelectronic properties is investigated for amorphous zinc tin oxide (a-ZTO) thin films deposited by RF sputtering. a-ZTO samples were annealed up to 500 °C in oxidizing, neutral, and reducing atmospheres before characterizing their structural and optoelectronic properties by photothermal deflection spectroscopy, near-infrared-visible UV spectrophotometry, Hall effect, Rutherford backscattering, hydrogen forward scattering and transmission electron microscopy. [...]
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2017-09-19
09:36
OpenAccess [FZJ-2017-06618] Journal Article
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Towards a holographic approach to spherical aberration correction in scanning transmission electron microscopy
Optics express 25(18), 21851-21860 (2017) [10.1364/OE.25.021851]
ddc:530
Recent progress in phase modulation using nanofabricated electron holograms has demonstrated how the phase of an electron beam can be controlled. In this paper, we apply this concept to the correction of spherical aberration in a scanning transmission electron microscope and demonstrate an improvement in spatial resolution. [...]
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