Charge, energy and bond dynamics at molecular interfaces

Numerous fascinating physical, chemical, and biochemical phenomena occur at interfaces, i.e. in the region where molecules of different types meet. Even if the
interactions between the molecules are weak (much weaker than, for instance, covalent or ionic bonds formed in chemical reactions) they can still substantially change the properties of the molecules involved. For this reason, molecules at the
interface may behave different from those in the bulk. This leads to the formation of specific ‘interfacial’ molecular layers bridging two phases of materials.
In this work, we study a number of specific properties of such interfaces in different multi-phase (heterogeneous) systems. We also focus on the consequences that interfaces impose on the behavior of the overall systems. The picture of
molecules at the interface cannot be a static one , it requires the additional dimension of observing how these molecules behave in time, i.e. their dynamics.
As a tool we use ultrafast multicolor spectroscopy – a technique in which molecules are selectively marked by an ultrashort (less then 10-13 s) optical pulse and their evolution in time is being traced by a second optical pulse which arrives
somewhat later and usually has a different color. We applied this technique to two quite different classes of systems: hydration shells of amphiphilic molecules dissolved in water and blends of conjugated polymers with organic acceptors. (Summary)

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