Pressure-induced correlation field splitting of the CH<sub>2</sub> rocking mode in the infrared spectra of methylene chain systems such as polyethylene, <i>n</i>-alkanes, surfactants, fatty acids, and model and biomembranes provides important information concerning the interchain structural and dynamic properties of these systems. The pressure at which the correlation field splitting starts is a measure of the orientational disorder of methylene chains along the chain axis. Moreover, the integrated intensity ratio between the correlation field component bands of the CH<sub>2</sub> rocking mode is a measure of the relative orientation of the zig-zag planes between neighboring methylene chains.

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