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![[Figure 2]](gf5019fig2mag.jpg)
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Figure 2
(a) Ratio between the top ROI and the bottom ROI of the 001 reflection of α-perylene as a function of the arrival time of the laser pulse TL; the step at T0 is fitted to an error function with a FWHM of 60 ps. (b) Difference image for TD = −200 ps − TReference = −3.68 µs; the laser pulse is arriving after the X-ray pulse in both images and only noise is seen. The intensity is scaled up by a factor of ten compared with the image in panel (c). (c) Difference image for TD = 100 ps − TReference = −3.68 µs; the laser pulse is arriving 100 ps before the X-ray pulse and the shift of the 001 reflection owing to thermal expansion of the lattice is seen. (d) The shift of the centre of mass in the vertical direction of the 001 reflection as a function of time delay for two different thin films. Circles: 700 nm-thick film; triangles: 500 nm-thick film; the error bars are the uncertainties on the fit of the centre of mass of the reflection peak. The change is proportional to the energy deposited in the film per unit volume and matches the laser intensity used in the experiment. |
![[Figure 2]](gf5019fig2.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
