Abstract
Lattice dynamics are calculated for KCl, KBr, RbCl, and AgBr. The following short-range forces are included: first-neighbor direct, deformation dipole, and indirect ionic interactions. The indirect ionic interactions are a model of three-body forces. A least-squares fit of the theory to the experimental results provides numerical values for the three-body forces. They are quite large for the Ag{sup +} ion.
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