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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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Dynamics of Chemical Bonding Mapped by Energy-Resolved 4D Electron Microscopy

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Title
Dynamics of Chemical Bonding Mapped by Energy-Resolved 4D Electron Microscopy
Author
Carbone, FabrizioKwon, Oh HoonZewail, Ahmed H.
Issue Date
2009-07
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Citation
SCIENCE, v.325, no.5937, pp.181 - 184
Abstract
Chemical bonding dynamics are fundamental to the understanding of properties and behavior of materials and molecules. Here, we demonstrate the potential of time-resolved, femtosecond electron energy loss spectroscopy (EELS) for mapping electronic structural changes in the course of nuclear motions. For graphite, it is found that changes of milli - electron volts in the energy range of up to 50 electron volts reveal the compression and expansion of layers on the subpicometer scale (for surface and bulk atoms). These nonequilibrium structural features are correlated with the direction of change from sp 2 [two-dimensional (2D) graphene] to sp3 (3D-diamond) electronic hybridization, and the results are compared with theoretical charge-density calculations. The reported femtosecond time resolution of four-dimensional (4D) electron microscopy represents an advance of 10 orders of magnitude over that of conventional EELS methods.
URI
https://scholarworks.unist.ac.kr/handle/201301/8738
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=67650441803
DOI
10.1126/science.1175005
ISSN
0036-8075
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CHM_Journal Papers
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