REPRESENTATIONS OF THE SYMMETRICAL GROUP GENERATED BY PROJECTED SPIN FUNCTIONS - A GRAPHICAL APPROACH

The representation matrices generated by the projected spin functions have some very interesting properties. All the matrix elements are int egers and they are quite sparse. A very efficient algorithm is present ed for the calculation of these representation matrices based on a gra phical approach and a new indexing scheme for representation of primit ive spin functions is introduced. Test calculations show that the meth od is very fast and suited for calculations on vector computers. (C) 1 996 John Wiley & Sons, Inc.