Spectrum of low frequencies in H₂O, D₂O and solutions of HF in H₂O

Measurements of the energy distribution of scattered neutrons reveal at low frequencies an indication of two peaks in water, a continuous spectrum in heavy water and one peak in aequous solutions of H F for concentrations of 5, 10 and 25 weight percent. A phenomenological description of the one peak observed for HF in H₂O in terms of the self-correlation function G_s(r, t) suggests that this peak is due to proton fluctuations.