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HipGISAXS : a high‐performance computing code for simulating grazing‐incidence X‐ray scattering data
Author(s) -
Chourou Slim T.,
Sarje Abhinav,
Li Xiaoye S.,
Chan Elaine R.,
Hexemer Alexander
Publication year - 2013
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889813025843
Subject(s) - grazing incidence small angle scattering , optics , scattering , superposition principle , computer science , refractive index , code (set theory) , x ray optics , light scattering , computational science , materials science , physics , small angle neutron scattering , x ray , neutron scattering , set (abstract data type) , quantum mechanics , programming language
This article describes the development of a flexible grazing‐incidence small‐angle X‐ray scattering (GISAXS) simulation code in the framework of the distorted wave Born approximation that effectively utilizes the parallel processing power provided by graphics processors and multicore processors. The code, entitled High‐Performance GISAXS , computes the GISAXS image for any given superposition of user‐defined custom shapes or morphologies in a material and for various grazing‐incidence angles and sample orientations. These capabilities permit treatment of a wide range of possible sample structures, including multilayered polymer films and nanoparticles on top of or embedded in a substrate or polymer film layers. In cases where the material displays regions of significant refractive index contrast, an algorithm has been implemented to perform a slicing of the sample and compute the averaged refractive index profile to be used as the reference geometry of the unperturbed system. A number of case studies are presented, which demonstrate good agreement with the experimental data for a variety of polymer and hybrid polymer/nanoparticle composite materials. The parallelized simulation code is well suited for addressing the analysis efforts required by the increasing amounts of GISAXS data being produced by high‐speed detectors and ultrafast light sources.