SOLVING THE SCHRODINGER-EQUATION AS A ONE -DIMENSIONAL PROBLEM .4. CORRELATION CONTRIBUTIONS FOR THE 2-ELECTRON SYSTEMS HE AND H-2 APPLYINGTHE ONE-DIMENSIONAL FORMALISM

After calculating ground and excited states of one-electron systems wi th improved discretization methods in Part III of this work it is show n that also correlation contributions can be yielded by this formalism . The more powerful discretization methods are applied to the two-elec tron systems He and H-2. For multi-electron systems the symmetry prope rties of the wave function become important but in the case of two-ele ctron systems an antisymmetric spin part can be separated and the inte gral kernel containing the spatial part of the wavefunction has theref ore to be symmetric.