ON THE ROLE OF DIFFERENT SPIN BASES WITHIN SPIN-COUPLED THEORY

The essential role played by different bases of spin eigenfunctions within spin-coupled theory is reviewed. Efficient methods are described for transforming a given set of spin-coupled coefficients between the Kotani, the Rumer and the Serber bases. The important physical and chemical insight into problems which is obtained by the use of different types of spin function is illustrated by several examples. It is shown that the Serber basis is particularly effective in this respect. In one case this leads to the prediction of an organic polymer which is antiferromagnetic.