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The large-radius exciton spectrum in a linear crystal with two atoms in theunit cell was obtained using the single-electron eigenfunctions and the bandstructure, which were found by the zero-range potential (ZRP) method. Theground-state exciton binding energies for the crystal in vacuum appeared to belarger than the corresponding energy gaps for any set of the crystalparameters.

Linear, diatomic crystal: single-electron states and large-radius excitons