Evolution of the spectral component of ice in the OH band of water at temperatures from 13 to 99°C

It is established for the first time by Raman scattering of second-harmonic pulses of an Nd:YAG laser that there are molecular complexes with frequencies of ~3600, ~3450, and ~3200 cm^-1 (which are characteristic of dimers, tetramers, and ice-like hexamers observed in H₂O molecular beams) in water at temperatures of 13 — 99°C. The frequency of the ice hexameric component is found to shift only slightly with an increase in the water temperature, whereas its contribution decreases but remains significant, with a simultaneous increase in the contribution of small complexes.