scholarly journals A compact electron gun for time-resolved electron diffraction

2015 ◽  
Vol 86 (1) ◽  
pp. 013109 ◽  
Author(s):  
Matthew S. Robinson ◽  
Paul D. Lane ◽  
Derek A. Wann
Keyword(s):  
Electron Diffraction ◽  
Electron Gun ◽  
Time Resolved

scholarly journals Optical fiber-driven low-energy electron gun for time-resolved streak diffraction

2019 ◽  
Vol 205 ◽  
pp. 08016
Author(s):  
Chiwon Lee ◽  
H. Kassier Gunther ◽  
R. J. Dwayne Miller
Keyword(s):  
Electron Diffraction ◽  
Optical Fiber ◽  
Low Energy ◽  
Energy Electron ◽  
Electron Gun ◽  
Single Shot ◽  
Optical Fibres ◽  
Time Resolved ◽  
Low Energy Electron Diffraction ◽  
Low Energy Electron

The wave guiding feature of the optical fibre optical fibres is specifically exploited to construct a novel type of electron gun to realize single-shot low-energy electron diffraction experiments with the sub-picosecond resolution for studying irreversible samples.

scholarly journals A Compact Ultrafast Electron Diffractometer with Relativistic Femtosecond Electron Pulses

2020 ◽  
Vol 4 (1) ◽  
pp. 4 ◽  
Author(s):  
Jinfeng Yang ◽  
Kazuki Gen ◽  
Nobuyasu Naruse ◽  
Shouichi Sakakihara ◽  
Yoichi Yoshida
Keyword(s):  
Electron Diffraction ◽  
Amorphous Materials ◽  
Crystalline Silicon ◽  
Electron Gun ◽  
Diffraction Measurement ◽  
Single Shot ◽  
Time Resolved ◽  
Single Crystalline ◽  
Electron Lens ◽  
Electron Pulses

We have developed a compact relativistic femtosecond electron diffractometer with a radio-frequency photocathode electron gun and an electron lens system. The electron gun generated 2.5-MeV-energy electron pulses with a duration of 55 ± 5 fs containing 6.3 × 104 electrons per pulse. Using these pulses, we successfully detected high-contrast electron diffraction images of single crystalline, polycrystalline, and amorphous materials. An excellent spatial resolution of diffraction images was obtained as 0.027 ± 0.001 Å−1. In the time-resolved electron diffraction measurement, a laser-excited ultrafast electronically driven phase transition in single-crystalline silicon was observed with a temporal resolution of 100 fs. The results demonstrate the advantages of the compact relativistic femtosecond electron diffractometer, including access to high-order Bragg reflections, single shot imaging with the relativistic femtosecond electron pulse, and the feasibility of time-resolved electron diffraction to study ultrafast structural dynamics.

Electron Channeling Patterns

1977 ◽  
Vol 35 ◽  
pp. 12-13
Author(s):  
David C. Joy
Keyword(s):  
Electron Diffraction ◽  
Incidence Angle ◽  
Photographic Plate ◽  
Diffraction Effect ◽  
Angle Of Incidence ◽  
Bulk Single Crystal ◽  
Time Resolved ◽  
Electron Channeling ◽  
Spatially Resolved ◽  
Large Bulk

Electron channeling patterns (ECP) were first found by Coates (1967) while observing a large bulk, single crystal of silicon in a scanning electron microscope. The geometric pattern visible was shown to be produced as a result of the changes in the angle of incidence, between the beam and the specimen surface normal, which occur when the sample is examined at low magnification (Booker, Shaw, Whelan and Hirsch 1967).A conventional electron diffraction pattern consists of an angularly resolved intensity distribution in space which may be directly viewed on a fluorescent screen or recorded on a photographic plate. An ECP, on the other hand, is produced as the result of changes in the signal collected by a suitable electron detector as the incidence angle is varied. If an integrating detector is used, or if the beam traverses the surface at a fixed angle, then no channeling contrast will be observed. The ECP is thus a time resolved electron diffraction effect. It can therefore be related to spatially resolved diffraction phenomena by an application of the concepts of reciprocity (Cowley 1969).

scholarly journals Femtosecond time-resolved MeV electron diffraction

2015 ◽  
Vol 17 (6) ◽  
pp. 063004 ◽  
Author(s):  
Pengfei Zhu ◽  
Y Zhu ◽  
Y Hidaka ◽  
L Wu ◽  
J Cao ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Time Resolved

Performance of an Indium-sealed S-band RF Photoelectron Gun for Time-resolved Electron Diffraction Experiments

2019 ◽  
Vol 74 (1) ◽  
pp. 24-29 ◽  
Author(s):  
Hyun Woo Kim ◽  
Kyu-Ha Jang ◽  
In Hyung Baek ◽  
Kitae Lee ◽  
Young Uk Jeong ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Time Resolved ◽  
Photoelectron Gun

scholarly journals Towards understanding triiodide photochemistry in the solid state by femtosecond electron diffraction

2019 ◽  
Vol 205 ◽  
pp. 09007
Author(s):  
Rui Xian ◽  
Stuart A. Hayes ◽  
Gaston Corthey ◽  
Carole A. Morrison ◽  
Alexander Marx ◽  
...  
Keyword(s):  
Solid State ◽  
Electron Diffraction ◽  
Large Amplitude ◽  
Atomic Level ◽  
Coherent Motion ◽  
Reaction Products ◽  
Time Resolved ◽  
Femtosecond Electron Diffraction

The photochemistry of the triiodide anion has been investigated by femtosecond electron diffraction. The time-resolved signal indicates the presence of reaction products and large-amplitude coherent motion produced by participating species. To reconstruct the atomic detail of the reaction and identify the major contributors to the detected signal, we outline the approach for atomic-level reconstruction.

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