Graphical unitary group approach


Graphical unitary group approach is a technique
used to construct Configuration state functions in
computational quantum chemistry. As reflected in its name, the
method uses the mathematical properties of the unitary group.
The foundation of the unitary group approach can be traced to the work of
Moshinsky. Later,
Shavitt
introduced the graphical aspect drawing on the earlier work of
Paldus.
Computer programs based on the GUGA method have been shown to be
highly efficient.
offering certain performance advantages over the older, sometimes
called traditional, techniques for CSF construction. However traditional methods can offer other
advantages such
as the ability to handle degenerate symmetry point groups, such as.