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Kwon, Oh Hoon
Ultrafast Laser Spectroscopy and Nano-microscopy (ULSaN Lab)
Research Interests
  • Femtochemistry/biology, 4D electron microscopy, structural dynamics, materials phenomena

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4D Imaging of Transient Structures and Morphologies in Ultrafast Electron Microscopy

Cited 83 times inthomson ciCited 82 times inthomson ci
Title
4D Imaging of Transient Structures and Morphologies in Ultrafast Electron Microscopy
Author
Barwick, BrettPark, Hyun SoonKwon, Oh HoonBaskin, J. SpencerZewail, Ahmed H.
Keywords
CRYSTALLOGRAPHY; DIFFRACTION; GRAPHITE; NANOSCALE; DYNAMICS; ATOMS
Issue Date
2008-11
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
SCIENCE, v.322, no.5905, pp.1227 - 1231
Abstract
With advances in spatial resolution reaching the atomic scale, two-dimensional (2D) and 3D imaging in electron microscopy has become an essential methodology in various fields of study. Here, we report 4D imaging, with in situ spatiotemporal resolutions, in ultrafast electron microscopy (UEM). The ability to capture selected-area-image dynamics with pixel resolution and to control the time separation between pulses for temporal cooling of the specimen made possible studies of fleeting structures and morphologies. We demonstrate the potential for applications with two examples, gold and graphite. For gold, after thermally induced stress, we determined the atomic structural expansion, the nonthermal lattice temperature, and the ultrafast transients of warping/bulging. In contrast, in graphite, striking coherent transients of the structure were observed in both image and diffraction, directly measuring, on the nanoscale, the longitudinal resonance period governed by Young's elastic modulus. The success of these studies demonstrates the promise of UEM in real-space imaging of dynamics.
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DOI
10.1126/science.1164000
ISSN
0036-8075
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PHY_Journal Papers
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