Two dimensional diffusion-controlled triplet-triplet annihilation kinetics.

ABSTRACT: Diffusion controlled chemical reactions are usually observed in three dimensional media. In contrast, planar bimolecular reactions taking place between reagents adsorbed at a soft interface are two-dimensional and therefore cannot be studied within the same formalism. Indeed, soft interfaces allow the adsorbed species to freely diffuse in a liquid-like manner. Here, we present the first experimental observation of a diffusion-controlled reaction in an environment that is planar at the ångström scale. By means of time-resolved surface second harmonic generation, an inherently surface sensitive technique, we observed that the kinetics of the diffusion of the reagents in the plane decreases as the surface concentration of adsorbed species increases. This is of course not the case for bulk rea

SUBMITTER: Gschwend GC 

PROVIDER: S-EPMC6761882 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature