Abstract
The Gordon-Kim method of calculating the interatomic potentials is modified with corrections to the exchange and dispersion interactions, and the interionic potentials in alkali-halide crystals are calculated from Roothaan-Hartree-Fock ionic wavefunctions. The lattice constants, cohesive energies and elastic constants of NaCl, NaF, NaBr, KCl, KF, KBr, RbCl, RbF and RbBr crystals are evaluated using the calculated interionic potentials. The agreement of the results with the experimental data is good.
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