Abstract
Rotational reorientation times of rhodamine 800 laser dye have been studied in a series of primary alcohols at room temperature by using steady-state and picosecond time-resolved fluorescence spectroscopy. Experimental rotational reorientation time shows, it increases linearly when the macroscopic viscosity of solvents increases. Hydrodynamic (SED) and Quasi hydrodynamic (GW and DKS) friction models qualitative analysis has been performed to determine mechanical friction contribution to the total friction experienced by laser dye. The results found interestingly that theoretically predicted rotational reorientation times underestimate experimental values.Deviations from the above models enable us to test for dielectric friction (NZ, ZH, and AW) theories and hydrogen bonding possibility between free clo-4 radical and –OH group of alcohol.
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