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4D visualization of transitional structures in phase transformations by electron diffraction

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2007

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Yang, Ding-Shyue
Zewail, Ahmed H.

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https://doi.org/10.1126/science.1147724
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Science. 2007, 318(5851), pp. 788-792. ISSN 0036-8075. eISSN 1095-9203. Available under: doi: 10.1126/science.1147724

Zusammenfassung

Complex systems in condensed phases involve a multidimensional energy landscape, and knowledge of transitional structures and separation of time scales for atomic movements is critical to understanding their dynamical behavior. Here, we report, using four-dimensional (4D) femtosecond electron diffraction, the visualization of transitional structures from the initial monoclinic to the final tetragonal phase in crystalline vanadium dioxide; the change was initiated by a near-infrared excitation. By revealing the spatiotemporal behavior from all observed Bragg diffractions in 3D, the femtosecond primary vanadium-vanadium bond dilation, the displacements of atoms in picoseconds, and the sound wave shear motion on hundreds of picoseconds were resolved, elucidating the nature of the structural pathways and the nonconcerted mechanism of the transformation.

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ISO 690BAUM, Peter, Ding-Shyue YANG, Ahmed H. ZEWAIL, 2007. 4D visualization of transitional structures in phase transformations by electron diffraction. In: Science. 2007, 318(5851), pp. 788-792. ISSN 0036-8075. eISSN 1095-9203. Available under: doi: 10.1126/science.1147724
BibTex
@article{Baum2007-11-02visua-43301,
  year={2007},
  doi={10.1126/science.1147724},
  title={4D visualization of transitional structures in phase transformations by electron diffraction},
  number={5851},
  volume={318},
  issn={0036-8075},
  journal={Science},
  pages={788--792},
  author={Baum, Peter and Yang, Ding-Shyue and Zewail, Ahmed H.}
}
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