4D Visualization of Transitional Structures in Phase Transformations by Electron Diffraction
Top Cited Papers
- 2 November 2007
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 318 (5851), 788-792
- https://doi.org/10.1126/science.1147724
Abstract
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.Keywords
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