SASfit  0.93.4
SASfit Developer Documentation
A program for fitting elementary structural models to small angle scattering data


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. Additionally an algorithm has been implemented, which allows to simultaneously fit several scattering curves with a common set of (global) parameters. This last option is especially important in contrast variation experiments or measurements with polarised neutrons. The global fit helps to determine fit parameters unambiguously which by analyzing a single curve would be otherwise strongly correlated. The program has been written to fulfill the needs at the small angle neutron scattering facility at PSI ( ). 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.

The latest stable SASfit version can be downloaded from

For User and Model Documentation, please see

For adding custom code to SASfit see:

The usage of SASfit routines in external programs is documented in:

See Also
Howto generate the SASfit source documentation

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