Raman spectroscopy of SrAg2I4⋅8H2O reveals three low frequency vibrations at 25, 65, and 105 cm−1. The 25 cm−1 line is extremely intense, has a narrow linewidth, and is assigned as a vibration of the Ag–I bond. This mode persists in the melt, verifying the hypothesis of Geller and Dudley that AgI4 entities are present in the saturated solution. Autocorrelation spectroscopy measurements on the saturated solutions do not reveal diffusion of these complexes; however, similar measurements on diluted solutions show diffusion of precipitated AgI.

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