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SAAF : small‐angle neutron scattering data analysis using analytical functions
Author(s) -
Zhao Jinkui
Publication year - 2011
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/s0021889811046188
Subject(s) - spallation neutron source , neutron scattering , physics , scattering , neutron , small angle neutron scattering , computational physics , data set , set (abstract data type) , neutron source , computer science , optics , nuclear physics , artificial intelligence , programming language
SAAF is a tool for analyzing small‐angle neutron scattering (SANS) data using analytical model functions. It is implemented in Perl and uses Gnuplot as its engine for curve fitting and data display. A set of standard models is provided with the program. New models are easy to implement at the user level. One of its features is the ability to perform de‐smearing on data sets with variable and convoluted instrument resolutions. For SANS experiments, data de‐smearing is often required, especially for data with small neutron scattering vector ( Q ) values or sharp scattering features. On time‐of‐flight instruments, the uncertainty in Q is a convolution of the contributions from neutrons with different wavelengths and beam intensities. SAAF is designed to take such Q resolution into account for data de‐smearing. The program is part of the tool set offered at the EQ‐SANS diffractometer at the Spallation Neutron Source. It is available in source form and is portable to multiple computer platforms.