Terahertz Kerr effect response on different concentrations [89
]. (a) TKE responses of water and NaCl solutions in different concentrations. Inset: an enlarged logarithmic view of the negative polarity responses. (b) The upper panel shows the measured peak-to-peak values (PPV) of TKE responses for NaCl, NaBr, and NaI solutions in different concentrations. The other panels show the extracted maximum values of TKE responses induced by OH…X−
hydrogen bond vibration (OH…X−
), the hydrogen bond stretching modes (Stret.), and the hydrogen bond bending (Bend.).