Yuji Sakai, Junji Watanabe and Shuichi Kinoshita Non-Markovian nature of the fluctuation of the polarizability in molecular liquids by time-domain and frequency-domain measurements Journal of Raman Spectroscopy 44
It is well known that spectra of molecular liquids in a low-wavenumber region show Lorentzian-like shape. However, we have found that the spectra are Lorentzian like in a limited wavenumber region, which is comparable with the half width ωd of the spectra. This is observed over three orders of magnitude of ωd ranging from ~0.005 to ~2 cm−1.
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