Abstract
The vibrational Raman spectra of a model bimembrane (DPPC) was used to probe its structural characteristics in the respective phases under high pressure. The frequency shift, band width and relative peak height (containing both intrachain and inter-chain order parameters) of the respective Raman bands were measured as a function of temperature with the following results: the structure below the 4th-transition temperature is reconfirmed as orthorhombic PE-type packing with all-trans chains. At the 4th-transition point, intra-chain and inter-chain disorderings clearly occur. Around the sub-transition, abnormality of the Raman spectra accompanied by a movement of the head group equivalent to a melting-like behavior (observed by WAXS) occurs. Above about 2.5 kbar (the tricritical point) in the pre-transition line, continuous structural changes are observed as the temperature increases through the pre-point in place of the discontinuous changes observed below about 2.5 kbar.
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