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Dihydrogen has been codeposited with alkali halides in argon matrices at -10 K. The presence of the alkali halide induces infrared activity which is assigned to the H-H stretching vibration that is red-shifted by as much as 114 cm-l from the position of the Q branch vibration of O-H2 in argon. The observations suggest that it is the anion of the alkali halide ion pair which is responsible for the perturbation of H2. Thus, the largest perturbations have been recorded for KF and CsF while the perturbation due to RbNO3 is not nearly as great as that for RbCl. Moreover, the position of the perturbed H-H stretch is quite insensitive to the size of the cation in the series of alkali chlorides. The extent of perturbation on the H-H stretch has been found to be greater for alkali halide monomers than for aggregates.

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