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"4D Visualization of Transitional Structures in Phase Transformations by Electron Diffraction" Peter Baum, Ding-Shyue Yang, and Ahmed H. ZewailScience 318, 788 (2007) 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. This publication has not been written at BMO BMO authors (in alphabetic order): Peter Baum Order Hardcopy |
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Letzte Änderung: 2016-09-14 13:34
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