Abstract
Some intensity expressions for low-frequency Raman, far-IR and inelastic neutron scattering are discussed. Low-frequency near infrared (NIR)-FT-Raman spectra (∼80 – 400 cm −1) of some proteins and their aqueous solutions are presented, along with low-frequency visible Raman spectra (10 – 400 cm −1) of their model systems, some liquid amides. A low-frequency band is observed in the R( \\ ̄ gn)-representation of these spectra at approximately 100 cm −1. This band is assigned to a mode involving atoms in hydrogen bonds. Three more quantitative models are used to describe it. The first model describes these low-frequency bands in terms of longitudinal and transverse mode density of states curves of one-dimensional hydrogen-bonded chains, the second model is a damped harmonic oscillator model, and the third model is the Gaussian cage model. A band with a maximum around 290 cm −1 might be sensitive to the water structure in aqueous protein solutions.
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