Abstract
AbstractLow‐wavenumber Raman spectra of the aqueous suspension of multilamellar vesicles made of 1,2‐dimyristoyl‐sn‐glycero‐3‐phosphocholine have been studied. The Raman susceptibility of phospholipid bilayers was experimentally found for the gel, ripple, and fluid lipid phases. Comparison of the Raman susceptibility with the inelastic neutron and X‐ray scattering data evidences that the Raman spectrum reflects the in‐plane phonon density of states. Also, the Raman susceptibility reveals peaks below ~ 30 cm−1 associating with the off‐plane modes. These peaks were found to be sensitive to the lipid phase. In particular, the ripple spectrum included the off‐plane modes of the fluid and gel phases. The low‐wavenumber Raman spectroscopy becomes a powerful method for studying THz vibrational modes of phospholipid bilayers, corresponding to nanometer response of the bilayers.
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