SASfit is a program for fitting structural models to small angle scattering data. Fit structural models with this tool. SASfit has been written for analyzing and plotting small angle scattering data. It can calculate integral structural parameters like radius of gyration, scattering invariant, Porod constant. Furthermore it can fit size distributions together with several form factors including different structure factors.

The program has been written to fulfill the needs at the small angle neutron scattering facility at PSI (kur.web.psi.ch). The numerical routines have been written in C whereas the menu interface has been written in tcl/tk and the plotting routine with the extension blt.

Small-angle scattering (SAS) is one of the powerful techniques to investigate the structure of materials on a mesoscopic length scale (10 - 10000 A). It is used to study the shapes and sizes of the particles dispersed in a homogenous medium. The materials could be a macromolecule (biological molecule, polymer, micelle, etc) in a solvent, a precipitate of material A in a matrix of another material B, a microvoid in certain metal or a magnetic inhomogeneity in a nonmoagnetic material.

SASfit is a program for analyzing small angle scattering data. The numerical tting routines are written in C and the menu interface in tcl/tk.

The license of this software is Freeware, you can free download and free use this calculator software.