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2pza According to Roothaan antibonding orbitals antisymmetrized product appendix approximation atomic orbitals atoms as calculated attractive energy bital bonding orbitals CATHOLIC UNIVERSITY Chem closed shell system configuration interaction culated degenerate in sets Diatomic Dissociation energy 3Z e.v. Comparable e.v. Dissociation energy effective nuclear charge eigenfunction equilibrium distance ergy excited atom excited orbital experimental values H-L theory Haurwitz He+ ion He2+ Helium Molecule improve the calculation interaction energy interaction treatment Interatomic Potential Energy internuclear axis internuclear parameter ionization energies itler London J.C. Slater large distances LCAO method LCAO-MO linear combinations London calculation matrix method gives MO calculation MO method molecular orbital theory Morse normal helium atom nuclei orthogonal orthonormality conditions parabola-like curve Phys potential energy curve range of internuclear Rosen second orbital singlet triplet splitting spin degeneracy spin degenerate spin orbitals subtracting symmetry orbitals total energy total wave function UNIVERSITY OF AMERICA value at large Virginia Griffing Waal1