FEMO treatment of all trans-polyenes with parametric energy dependences

The semi-empirical free electron theory with inclusion of interelectronic and electron-nuclear molecular integrals is used to examine the spectroscopic properties of the trans-polyenes. The molecular integrals were calculated at many values ofQ, the free electron theory length parameter. Comparisons are made to equivalent LCAO-MO methods, especially in regard to molecular coulomb and exchange integrals, singlet-triplet separations and parametric dependence. The FET viriel theorem is examined.