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(a) Room temperature TDS images of Bi at 13 keV oriented with (11–2) nearly parallel to the x-ray direction (grazing angle = ) with no laser illumination. (b) Calculated first order TDS, on top of which displayed the Brillouin zone boundaries. (c) Difference between laser-off and laser-late frame for comparison. (d)-(i) Differences between a few laser-early frames and laser-late frame, , showing the evolution of phonon distribution. ((c)-(i) use the same scale.)
Averages of the difference data. (a) Time averaged image (normalized), in which each pixel is averaged over all the time delays; and (b) relative change of the pixel averaged data to the static image. In each case, regions around the Bragg rods were masked out.
Variation of the difference-images relative to the average for selected time delays. These figures are scaled by the normalization factor used for Fig. 2(a) , so that we can compare their amplitudes.
Diffuse scattering images with laser on at different time delays minus images with laser off, i.e., , from our quasi-single-shot melting measurement. Each image is averaged over 5 pulses on the same sample spot, and different delay images are taken on different spots.
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