A new setup for high resolution fast X-ray reflectivity data acquisition

A new method for fast x-ray reflectivity data acquisition is presented. The method is based on a fast rotating, slightly tilted sample reflecting to a stationary mounted position sensitive detector and it allows for measurements of reflectivity curves in a quarter of a second. The resolution in q-space mainly depends on the beam properties and the pixel size of the detector. Maximum q_z-value of 1 Å^-1 can be achieved. The time-temperature depending structure changes of poly(N-isopropylacrylamide) thin films were investigated in situ by applying the fast-reflectivity setup. The results are presented in this paper as illustration of the method and proof of principle.