scholarly journals The Stripe of Electron Diffraction in Magnetic Field—A Counterexample. In Electric Field, the Result Will Be the Same

2021 ◽  
Author(s):  
Runsheng Tu
Keyword(s):  
Magnetic Field ◽  
Quantum Mechanics ◽  
Electron Diffraction ◽  
Experimental Evidence ◽  
Experimental Result ◽  
Diffraction Experiment ◽  
Particle Path ◽  
Electron Diffraction Experiment ◽  
Diffraction Patterns ◽  
Double Slit Experiment

Abstract As long as no one has done diffraction experiment in the spark chamber (DESC) , it makes sense to do this experiment. This experiment has two possible results: (1) Diffraction fringes cannot be obtained; (2) Path information and diffraction patterns can be obtained at the same time. If the result is (1), it provides direct and unambiguous experimental evidence for the existing Copenhagen quantum mechanics interpretation system, which can avoid some unnecessary disputes; If the result is (2), it will cause a scientific revolution in the field of quantum mechanics interpretation (After all, most people now think that "as long as the particle path is observed in the double slit experiment, the interference fringes will disappear"). "The result of the electron diffraction experiment in a magnetic field—diffraction fringes can still be obtained" was discovered. This finding provides an experimental evidence for DESC to be meaningful and predicts that the experimental result of DESC is the result (2).

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)]|.

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.

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