Ethene neutral, energy levels

Fig. 4.15 The n molecular orbitals and n energy levels for a two-p-orbital system in the simple Hiickel method. The MOs are composed of the basis functions (two p AOs) and the eigenvectors, while the energies of the MOs follow from the eigenvalues (Eq. 4.66). The paired arrows represent a pair of electrons of opposite spin (in the electronic ground state of the neutral ethene molecule i[/ is occupied and i//2 is empty)...

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