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Excluded volume effect within the continuous model for the fluorescence energy transfer.

Olga Tcherkasskaya1, Angela M Gronenborn, Leonid Klushin

  • 1Department of Biochemistry and Molecular Biology, Medical Center, Georgetown University School of Medicine, 3900 Reservoir Road NW, Washington, DC 20007-2197, USA. ovt@georgetown.edu

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|November 5, 2002
PubMed
Summary

This study reveals that excluded volume effects in electronic energy transfer create complex donor fluorescence decay patterns. A crossover in decay indicates limitations of simplified models, highlighting the importance of molecular interactions and spatial restrictions.

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Area of Science:

  • Photochemistry
  • Physical Chemistry
  • Spectroscopy

Background:

  • Electronic energy transfer is crucial in photochemistry and materials science.
  • Understanding fluorescence decay dynamics is key to characterizing molecular interactions.
  • Existing models often simplify spatial distributions of molecules.

Purpose of the Study:

  • To investigate the impact of excluded volume on donor fluorescence intensity decay.
  • To develop a more accurate model for electronic energy transfer dynamics.
  • To analyze the influence of molecular size and spatial restrictions on energy transfer.

Main Methods:

  • Theoretical calculation of ensemble-average fluorescence intensity decay.
  • Inclusion of excluded volume effects in the model.
  • Analysis of time-dependent decay patterns and identification of crossover phenomena.

Main Results:

  • Donor decay exhibits complex time dependence when excluded volume is considered.
  • A crossover between two distinct time regimes was identified in the decay.
  • The crossover correlates with minimal molecular distance (r(m)) and interaction strength (R(0)).

Conclusions:

  • Simplified models like the stretched exponential fail to capture the complexity introduced by excluded volume.
  • The "apparent dimensionality" derived from simplified models can be misleading.
  • Accurate modeling of electronic energy transfer requires accounting for spatial restrictions and molecular interactions.