Als-Nielsen, J.Pershan, Peter2013-03-011983Als-Nielsen, J., and Peter S. Pershan. 1983. Synchrotron X-ray diffraction study of liquid surfaces. Nuclear Instruments and Methods in Physics Research 208(1-3): 545-548.0168-9002http://nrs.harvard.edu/urn-3:HUL.InstRepos:10361603A spectrometer for X-ray diffraction and refraction studies of horizontal, free surfaces of liquids is described. As an illustration smetic-A layering at the surface of a liquid crystal is presented.en-USJournal Article10.1016/0167-5087(83)91179-1