4D Visualization of Transitional Structures in Phase Transformations by Electron Diffraction

by: Peter Baum, Ding-Shyue Yang, Ahmed H Zewail

Science, Vol. 318, No. 5851. (2 November 2007), pp. 788-792.

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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 vanadiumvanadium 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. 10.1126/science.1147724

@article{citeulike:1858390, 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 vanadiumvanadium 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. 10.1126/science.1147724}, author = {Baum, Peter and Yang, Ding-Shyue and Zewail, Ahmed H. }, citeulike-article-id = {1858390}, doi = {10.1126/science.1147724}, journal = {Science}, month = {November}, number = {5851}, pages = {788--792}, posted-at = {2007-11-03 03:40:50}, priority = {0}, title = {4D Visualization of Transitional Structures in Phase Transformations by Electron Diffraction}, url = {http://dx.doi.org/10.1126/science.1147724}, volume = {318}, year = {2007} }

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TY - JOUR ID - citeulike:1858390 L3 - citeulike-article-id:1858390 TI - 4D Visualization of Transitional Structures in Phase Transformations by Electron Diffraction JF - Science VL - 318 IS - 5851 SP - 788 EP - 792 N2 - 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 vanadiumvanadium 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. 10.1126/science.1147724 AU - Baum, Peter AU - Yang, Ding-Shyue AU - Zewail, Ahmed PY - 2007/11/02/ UR - http://dx.doi.org/10.1126/science.1147724 ER -

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