Hückel method
= Hückel method
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A model of conjugated $\pi$ <molecular orbitals> with an orthonormal atomic basis, one-centre energies $\alpha_i$, and resonance matrix elements $\beta_{ij}$ between selected neighbouring sites. Solving $H\mathbf c=E\mathbf c$ gives orbital <energies> and coefficients. Its simplicity makes symmetry and electron filling explicit, but quantitative charge predictions can depend strongly on the chosen parameters and omitted orbital relaxation.