Theoretical investigation of fluorescence concentration quenching in two-dimensional disordered systems. Application to chlorophyll a in monolayers of dioleylphosphatidylcholine
- 15 January 1987
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 86 (2) , 503-507
- https://doi.org/10.1063/1.452301
Abstract
A master equation approach is used for investigating energy transfer and trapping in two-dimensional disordered systems, where the traps are statistical pairs of pigment molecules closer than a critical distance Rc. Fluorescence decay curves are calculated over a range of concentrations as a function of Rc and the Förster transfer radius R̄0. The concentration dependence of the lifetimes is compared to the fluorescence self-quenching data that Chauvet et al. obtained from real-time measurements in monolayers of chlorophyll a and dioleylphosphatidylcholine (DOL). This dependence is found to be close to second order and for a choice of Rc =10 Å the experimental data are fit if R̄0=78±2 Å. This value is in close agreement with those found in the literature from depolarization measurements.Keywords
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