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  • The Thirteenth International Conference on Ultrafast Phenomena
  • 2002 OSA Technical Digest Series (Optica Publishing Group, 2002),
  • paper WD32
  • https://doi.org/10.1364/UP.2002.WD32

Probing solvation dynamics at aqueous lipid-membrane interfaces with 3-pulse photon-echo peak-shifts

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Three-pulse photon-echo peak-shift (3PEPS) experiments were performed to explore structural relaxations relevant to solvation of a cyanine dye non-covalently anchored to aqueous interfaces of unilamellar phospholipid vesicles. The influence of the lipid polymorphism is studied through the temperature-dependence of the 3PEPS decay. As opposed to the main order/disorder phase transition connected with packing phenomena in the hydrophobic membrane core, the rippled-to-gel pre-transition strongly affects the solvation response on time scales below 2 ps. This finding indicates that the pre-transition is connected with structural modifications of the hydration shell surrounding the polar head groups and is consistent with a dehydration of the interface.

© 2002 Optical Society of America

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