The ab initio cyclic cluster model is presented by Michael F. Peintinger and Thomas Bredow on page 839 (DOI: 10.1002/jcc.23550). The similarity between this Γ-point and molecular approaches allows in principle the application of sophisticated post Hartree–Fock methods to solid-state problems. The cover background shows the treatment of four-center integrals of a periodic hydrogen chain within the Wigner–Seitz supercells of the atoms. The foreground shows the unit cell of this system. The results obtained by the conventional supercell model are fully reproduced, as shown by the crystalline orbitals of the H8 cluster.
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