The confined-oscillator scaling model gives the stretching frequencies ${\nu }_0$ of isolated ${\mathrm{CN}}^{\mathrm{-}}$ impurities in alkali halide and silver halide crystals and ${\nu }_3$ of ${\mathrm{CN}}^{\mathrm{-}}$ molecules sandwiched between satellite impurity cations in terms of (1) the kind of neighbor-ion species, (2) the axial space availability, and (3) the position of neighbor ions relative to the host lattice.

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