Determination of the dynamics of microcharacteristics of solutions by time laser spectroscopy |
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Authors: | V I Tomin and A Krzysztofowicz |
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Institution: | 1.Institute of Physics,Pomeranian University in Slupsk,Slupsk,Poland |
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Abstract: | The development of simple methods used to analyze the available data and separate the contributions from the main physicochemical
processes responsible for the kinetics of instantaneous emission spectra is of considerable interest due to the intensive
investigation of the time-resolved characteristics of fluorescence of various quantum objects that are used to examine the
most important photophysical and photochemical reactions in excited states. The relation between the functions of the shift
in the instantaneous spectra of spontaneous emission of molecules (obtained using kinetic spectroscopy methods) and the time
variations in the configurational structure of solvates, as well as the charge transfer in the excited singlet state of molecules
of the luminescent probe, has been shown using simple analytical expressions of solvatofluorochromism. The fluorescence of
solutions of one of the most important molecular probes, namely, 1-(phenylamino)naphthalene in glycerol, has been investigated
with a picosecond time resolution. This molecular probe is known because its electric dipole moment is formed in the excited
singlet state, which almost instantaneously initiates processes of intermolecular rearrangement of solvent molecules. It has
been demonstrated that it is possible to determine the time dependence of the function of the dielectric response of the polar
solvent to the dipole of this probe and, hence, the time evolution of the microcharacteristics of the solvent that determine
the above function. |
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