How to realize an ultrafast electron diffraction experiment with a terahertz pump: a theoretical study

2021 ◽  
Author(s):  
Dan Wang ◽  
Xuan Wang ◽  
Guoqian Liao ◽  
Zhe Zhang ◽  
Yutong Li
Keyword(s):  
Electron Diffraction ◽  
Structural Dynamics ◽  
Electron Probe ◽  
Theoretical Study ◽  
Structural Information ◽  
Incident Angle ◽  
Diffraction Experiment ◽  
Ultrafast Electron Diffraction ◽  
Electron Diffraction Experiment ◽  
Theoretical Simulation

Abstract To integrate a terahertz pump into an ultrafast electron diffraction (UED) experiment has attracted much attention due to its potential to initiate and detect the structural dynamics both directly. However, the deflection of the electron probe by the electromagnetic field of the terahertz pump alters the incident angle of the electron probe on the sample, impeding it from recording structural information afterwards. In this article, we studied this issue by a theoretical simulation of the terahertz-induced deflection effect on the electron probe, and came up with several possible schemes to reduce such effect. As a result, a terahertz-pump-electron-probe UED experiment with a temporal resolution comparable to the terahertz period is realized. We also found that MeV UED was more suitable for such terahertz pump experiment.

Structural studies of small amorphous volumes by electron diffraction

1990 ◽  
Vol 48 (4) ◽  
pp. 122-123
Author(s):  
Pierre Moine
Keyword(s):  
Electron Diffraction ◽  
Born Approximation ◽  
Structural Information ◽  
Fundamental Relation ◽  
X Rays ◽  
Structural Studies ◽  
Diffraction Experiment ◽  
Transmission Electron ◽  
Amorphous Structures ◽  
Diffraction Patterns

Qualitatively, amorphous structures can be easily revealed and differentiated from crystalline phases by their Transmission Electron Microscopy (TEM) images and their diffraction patterns (fig.1 and 2) but, for quantitative structural information, electron diffraction pattern intensity analyses are necessary. The parameters describing the structure of an amorphous specimen have been introduced in the context of scattering experiments which have been, so far, the most used techniques to obtain structural information in the form of statistical averages. When only small amorphous volumes (< 1/μm in size or thickness) are available, the much higher scattering of electrons (compared to neutrons or x rays) makes, despite its drawbacks, electron diffraction extremely valuable and often the only feasible technique.In a diffraction experiment, the intensity IN (Q) of a radiation, elastically scattered by N atoms of a sample, is measured and related to the atomic structure, using the fundamental relation (Born approximation) : IN(Q) = |FT[U(r)]|.

scholarly journals Observation of counterion effects and dimensionality reduction in single-crystal (EDO-TTF)2SbF6 with ultrafast electron diffraction

2019 ◽  
Vol 205 ◽  
pp. 04007
Author(s):  
Lai Chung Liu ◽  
Yifeng Jiang ◽  
Henrike M. Mueller-Werkmeister ◽  
Cheng Lu ◽  
Gustavo Moriena ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Electron Diffraction ◽  
Dimensionality Reduction ◽  
Single Crystal ◽  
Structural Dynamics ◽  
Dominant Role ◽  
Ultrafast Electron Diffraction ◽  
Femtosecond Electron Diffraction ◽  
Lower Dimensional

Femtosecond electron diffraction is used to resolve structural dynamics in single-crystal (EDO-TTF)2XF6 (X = P, Sb). The retarded and lower-dimensional dynamics of the latter illustrate the dominant role of counterion motion in stabilizing electron transfer.

The Study of Solid Structural Dynamics Using Ultrafast Electron Diffraction and Microscopy

2019 ◽  
Vol 127 (1) ◽  
pp. 19-25
Author(s):  
B. N. Mironov ◽  
S. A. Aseev ◽  
S. V. Chekalin ◽  
A. A. Ishchenko ◽  
V. O. Kompanets ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Structural Dynamics ◽  
Ultrafast Electron Diffraction

Ultrafast structural dynamics of boron nitride nanotubes studied using transmitted electrons

Nanoscale ◽  
2017 ◽  
Vol 9 (35) ◽  
pp. 13313-13319 ◽  
Author(s):  
Zhongwen Li ◽  
Shuaishuai Sun ◽  
Zi-An Li ◽  
Ming Zhang ◽  
Gaolong Cao ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Electron Diffraction ◽  
Boron Nitride ◽  
Femtosecond Laser ◽  
Structural Dynamics ◽  
Laser System ◽  
Boron Nitride Nanotubes ◽  
Ultrafast Electron Diffraction ◽  
Transmission Electron ◽  
System P

Ultrafast electron diffraction studies of structural dynamics of boron nitride nanotubes using a transmission electron microscope with a femtosecond laser system.

Diffraction, crystallography and microscopy beyond three dimensions: structural dynamics in space and time

2004 ◽  
Vol 363 (1827) ◽  
pp. 315-329 ◽  
Author(s):  
Ahmed H. Zewail
Keyword(s):  
Electron Microscopy ◽  
Electron Diffraction ◽  
Gas Phase ◽  
Structural Dynamics ◽  
Research Area ◽  
Three Dimensions ◽  
Ultrafast Electron Diffraction ◽  
Major Research ◽  
Condensed Media ◽  
Recent Developments

In this article we highlight recent developments of ultrafast electron diffraction and crystallography at Caltech. These developments have made it possible to resolve transient structures, both spatially (0.01 Å) and temporally (picosecond and now femtosecond), in the gas phase and condensed media—surfaces, interfaces, and crystals—with wide-ranging applications. With the extension to ultrafast electron microscopy, discussed here and elsewhere, we present an overview of one major research area at our centre, the Laboratory for Molecular Sciences.

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