Topic: vibrational spectroscopy

Water’s rapidly changing hydrogen-bond network links molecular interactions to its unusual bulk properties. The talk introduces correlated vibrational spectroscopy (CVS), which combines higher-order optical measurements, symmetry selection and angular polarimetry to isolate signals from interacting molecules and directly examine low-frequency hydrogen-bond stretching. CVS measurements reveal electronic charge transfer and nuclear quantum effects in water and acidic or basic solutions. Hydroxide donates roughly 8% more negative charge to the network than water, while protons reduce transfer by