Frequency-Dependent Vibrational Relaxation Time of OH Stretch at the Air/Isotopically Diluted Water Interface.

ABSTRACT: Elucidation of the vibrational relaxation process of interfacial water is indispensable for understanding energy dissipation at the aqueous interface. In this study, the vibrational relaxation dynamics of the hydrogen-bonded OH (HB OH) stretch vibration was investigated at the air/isotopically diluted water (HOD-D₂O) interface by time-resolved heterodyne-detected vibrational sum frequency generation (TR-HD-VSFG) spectroscopy. We observed the temporal change of the excited-state band (v = 1 → 2 transition), which enables a reliable determination of the T₁ time of interfacial water. The T₁ times obtained for the HB OH stretch with various pump frequencies are 0.14 ± 0.15 ps (3200 cm^-1), 0.27 ± 0.05 ps (3300 cm^-1), 0.

SUBMITTER: Kinoshita E 

PROVIDER: S-EPMC11789769 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature