Abstract
Installed in 1999 the energy-dispersive reflectometer at the 13.2 bending magnet employs the exponentially decaying white X-ray emission spectrum of the 1.7 GeV storage ring of BESSY II outside the vacuum. Using an energy-dispersive detector specular and longitudinal-diffuse reflectivity spectra of thin films can be recorded simultaneously between 0.2 Å −1< q z <1.2 Å −1 within a few seconds. The capability of the experiment is demonstrated probing the correlation length of Cd-arachidate and -stearate films at room temperature and its change during annealing. At T=70°C we observe an instantaneous decay of specular Bragg peaks accompanied with an increase of the diffuse scattering. This indicates the onset of the melting of 2D-ordered acid domains. The vertical diffusion coefficient is estimated to be about 2×10 −24 m 2/s.
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