Fundamental Stretching Vibration in Liquid Water

Abstract

WE have recently investigated the fundamental stretching vibration of liquid water in the infra-red region 4,000–2,000 cm⁻¹ using the thin cell technique developed by Thompson¹. The spectra, recorded under high-resolution conditions on a Perkin–Elmer 125 spectrometer, are shown in Fig. 1. It is apparent that the absorption in the 3,450 cm⁻¹ region is complex and composed of three bands with frequencies of ∼3,625 cm⁻¹, 3,410 cm⁻¹ and 3,250 cm⁻¹. The band profile is almost identical to that observed in the Raman effect (see, for example, Schultz and Hornig²).