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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
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