Abstract
The effect of ion–ion interactions on the structure and dynamics of the sulfate ion in aqueous MgSO 4 solution has been studied by polarization-resolved CARS spectroscopy. Depolarization ratio of the totally symmetric S–O stretch band of the SO 4 2− ion was determined accurately for three different MgSO 4 concentrations, 0.8, 1.3, 2.5 mol dm −3 . At 0.8 mol dm −3 , the observed depolarization ratio was zero as expected from T d symmetry. On the other hand, small but meaningful non-zero depolarization ratios were obtained at higher concentrations. These non-zero depolarization ratios are interpreted in terms of symmetry lowering of the sulfate ion, which is due to dynamic ion pair formation between Mg 2+ and SO 4 2− ions.
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