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.

Ultrafast Imaging of Molecules with Electron Diffraction

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Martin Centurion ◽  
Thomas J.A. Wolf ◽  
Jie Yang
Keyword(s):  
Electron Diffraction ◽  
Gas Phase ◽  
Structural Dynamics ◽  
Mechanical Energy ◽  
Annual Review ◽  
Publication Date ◽  
Ultrafast Electron Diffraction ◽  
Ultrafast Imaging ◽  
Ideal Tool ◽  
Nuclear Geometry

Photoexcited molecules convert light into chemical and mechanical energy through changes in electronic and nuclear structure that take place on femtosecond timescales. Gas phase ultrafast electron diffraction (GUED) is an ideal tool to probe the nuclear geometry evolution of the molecules and complements spectroscopic methods that are mostly sensitive to the electronic state. GUED is a passive probing tool that does not alter the molecular properties during the probing process and is sensitive to the spatial distribution of charge in the molecule, including both electrons and nuclei. Improvements in temporal resolution have enabled GUED to capture coherent nuclear motions in molecules in the excited and ground electronic states with femtosecond and subangstrom resolution. Here we present the basic theory of GUED and explain what information is encoded in the diffraction signal, review how GUED has been used to observe coherent structural dynamics in recent experiments, and discuss the advantages and limitations of the method. Expected final online publication date for the Annual Review of Physical Chemistry, Volume 73 is April 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

scholarly journals Imaging the ring opening reaction of 1,3-cyclohexadiene with MeV ultrafast electron diffraction

2019 ◽  
Vol 205 ◽  
pp. 07006
Author(s):  
Thomas J. A. Wolf ◽  
Jie Yang ◽  
David M. Sanchez ◽  
J. Pedro. F. Nunes ◽  
Robert M. Parrish ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Gas Phase ◽  
Structural Dynamics ◽  
Large Amplitude ◽  
Ring Opening ◽  
Ultrafast Electron Diffraction ◽  
Space And Time ◽  
Ring Opening Reaction ◽  
Large Amplitude Motions

We resolve the structural dynamics of the ultrafast photoinduced ring opening reaction of 1,3-cyclohexadiene in space and time employing megaelectronvolt gas phase ultrafast electron diffraction. We, furthermore, observe coherent large amplitude motions of the photoproduct.

scholarly journals Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction

2019 ◽  
Vol 6 (5) ◽  
pp. 054305 ◽  
Author(s):  
X. Shen ◽  
J. P. F. Nunes ◽  
J. Yang ◽  
R. K. Jobe ◽  
R. K. Li ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Gas Phase ◽  
Ultrafast Electron Diffraction ◽  
Electron Volt

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.

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