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Two-Photon Excited Fluorescence and Molecular Reorientations in Liquid Solutions |
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| Authors: | Linus Ryderfors Emad Mukhtar Lennart B-Å Johansson |
| Institution: | Department of Photochemistry and Molecular Science, Uppsala University, 751 20-Uppsala, Sweden. |
| Abstract: | Theoretical expressions are derived that relate the two-photon excited fluorescence depolarisation experiments to the molecular symmetry and the rotational motions of fluorescent molecules. Diffusive rotational motions in liquid solvents are considered, as well as the influence of fast unresolved motions (e.g. librations). The results obtained are compared with one-photon excited fluorescence depolarisation experiments. The derived theoretical expressions can be applied for detailed analyses of the molecular rotation in solvent. Several of the results are useful for determining and assigning the components of two-photon absorption tensors. |
| Keywords: | Two-photon excited fluorescence Two-photon excited fluorescence depolarisation Two-photon excited anisotropy Theory of rotational motion Rotational diffusion Librations Perylene |
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