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Diffusion affected magnetic field effect in exciplex fluorescence.

Anatoly I Burshtein1, Anatoly I Ivanov2

  • 1Weizmann Institute of Science, Rehovot 76100, Israel.

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Summary

The fluorescence of photoexcited exciplexes is sensitive to magnetic fields, with this magnetic field effect depending on solvent viscosity. Theoretical models show this effect peaks at intermediate solvent diffusivities.

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Area of Science:

  • Photochemistry
  • Chemical Physics
  • Physical Chemistry

Background:

  • Exciplex fluorescence is sensitive to external magnetic fields.
  • This sensitivity affects spin conversion efficiency in radical ion pairs.
  • The magnetic field effect on exciplex fluorescence is known to depend on solvent viscosity.

Purpose of the Study:

  • To theoretically reproduce the experimentally observed magnetic field effect on exciplex fluorescence.
  • To investigate the influence of solvent properties on the magnetic field effect.
  • To analyze the relationship between magnetic field effects and spin dynamics in radical ion pairs.

Main Methods:

  • Theoretical modeling of exciplex formation and photophysics.
  • Simulation of radical ion pair spin dynamics under magnetic fields.
  • Analysis of solvent effects, including viscosity and diffusivity, on the magnetic field effect.

Main Results:

  • The magnetic field effect on exciplex fluorescence was theoretically reproduced.
  • The magnetic field effect was found to vanish at high and low solvent diffusivities, with a maximum in between.
  • Sensitivity to solvent dielectric constant and conversion rates was also observed.

Conclusions:

  • Solvent properties, particularly diffusivity and viscosity, play a crucial role in modulating the magnetic field effect on exciplex fluorescence.
  • Theoretical modeling provides a valuable tool for understanding complex photophysical phenomena influenced by external fields and solvent environments.
  • The findings offer insights into controlling spin dynamics in photoinduced electron transfer processes.