SASfit: a tool for small-angle scattering data analysis using a library of analytical expressions

Area of Science:

• Materials Science
• Computational Physics
• Polymer Science

Background:

• SASfit is a long-standing program for analyzing small-angle scattering (SAS) data.
• Continuous development is essential for advanced scientific data analysis tools.

Purpose of the Study:

• To detail the latest advancements in the SASfit program package (version 0.94.6).
• To showcase new features enhancing data processing, parameter assessment, and model flexibility.
• To provide practical examples of SASfit's application in materials characterization.

Main Methods:

• Implementation of advanced algorithms for reducing oversampled small-angle scattering datasets.
• Enhancement of confidence assessment for optimized model parameters.
• Development of a flexible plug-in system for user-defined models, exemplified by a mass fractal model for branched polymers.

Main Results:

• SASfit version 0.94.6 introduces improved handling of oversampled data and more reliable parameter confidence intervals.
• A new plug-in system allows for the integration of custom scattering models.
• The software is now available on Windows, Linux, and MacOS, supported by extensive documentation and online resources.

Conclusions:

• The updated SASfit package provides a more robust and flexible platform for small-angle scattering data analysis.
• New features facilitate advanced analysis and custom model development.
• SASfit is a valuable tool for characterizing nanomaterials and complex polymer systems.