4. In a linear crystal of 2N ions of alternating charge tq with a repulsive potential energy A/R" between nearest neighbors, show that at equilibrium separation, the binding energy U(Req) = [2Nq² In 2/Rq (1-1/n).
4. In a linear crystal of 2N ions of alternating charge tq with a repulsive potential energy A/R" between nearest neighbors, show that at equilibrium separation, the binding energy U(Req) = [2Nq² In 2/Rq (1-1/n).
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