Morphology of off-specular neutron scattering pattern from islands on a lamellar film

The distorted wave born approximation (DWBA)-based theory is developed and employed to analyze off-specular neutron scattering from islands on the sur face of deuterated polystyrene-polybutylmethacrylate (dPS-PBMA) copolymer f ilm. II is shown that the scattering intensity distribution measured over a broad range of angles of incidence, including the range of total reflectio n, can be well interpreted within the simple model of random island distrib ution over the surface. Only a few film and island parameters, such as mean lateral size, concentration, and those characterizing their internal struc ture are needed to describe a variety of the features observed experimental ly. (C) 2000 Elsevier Science B.V. All rights reserved.