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Single shot diffraction images (UED) measured by two different lens modes: a wide-momentum mode (a) and a high-resolution mode (b). The scattering vectors of (200) and (220) peaks are 0.490 and 0.693 Å−1, respectively. (c) Typical time-evolution of the (000)-order peak obtained by single-shot measurement at F = 27 mJ cm−2. (d) Evolution of the (200) Bragg peak intensity of a single crystal gold film under three different incident fluences, F = 1, 27 and 41 mJ cm−2. The intensity averaged over four equivalent (200) Bragg-peak spots is plotted.
Direct comparison between experimental and theoretical signals for the incident fluences of (a) , (b) 27, and (c) 41 mJ cm−2, for a 10 nm single crystal Au films. The legend in (c) applies to the three panels. In (a) each point was determined from a 10-shot average, as the process is completely reversible, whilst in (b,c) each point was determined from an average of three single shot data. The finite time-resolution of the experimental setup (180 fs) is taken into account in the simulations.
Cross-sections of the atomistic simulations of ultrafast dynamics of single crystal Au films at selected simulation times for a 10 nm film (a) at mJ cm−2 (see supplementary material 28 ) and (b) at mJ cm−2 (see supplementary material 28 ). All atoms are colour-coded according to the measure of a degree of crystallinity given by the (nearest-neighbour averaged) centro-symmetry parameter ; 10 blue atoms ( ) have local crystalline structure, red atoms ( ) have highly disordered surroundings.
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