Fig. 2: TKE response of aqueous salt solutions. | Nature Chemistry

Fig. 2: TKE response of aqueous salt solutions.

From: Time-resolved terahertz–Raman spectroscopy reveals that cations and anions distinctly modify intermolecular interactions of water

Fig. 2

a, Terahertz-driven transient optical birefringence of a series of salts with strong cations and Cl− as their counterion, at 4 M concentration. The signal amplitude is cation specific and increases with SCD: MgCl2 > LiCl > NaCl > KCl > H2O. b, The same as a but for strong anions at their maximum concentrations with K+ or Na+ as the counterion. The signal amplitude is anion specific and decreases with SCD: Na2CO3 < Na2SO4 < KF < H2O. MgSO4 salt is composed of a strong cation and a strong anion; hence its birefringence signal at 2 M concentration is added to both panels (dashed blue line). Red arrows indicate the TKE amplitude variation with respect to that of pure water.

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