Relationship between excitation transport and fluorescence depolarization in two- and three-dimensional disordered systems: effect of residual polarization

Journal Article · Thu Sep 10 00:00:00 EDT 1987 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100303a035· OSTI ID:5954286

Anfinrud, P A; Struve, W S

Fluorescence depolarization experiments in electronic excitation transport are frequently analyzed under the assumption that fluorescence becomes completely depolarized after a single excitation hop from the initially excited molecule. The authors review Galanin's calculation of the residual polarization P/sub 1/ after a single hop in a random 3-dimensional system, and we extend this calculation to 2-dimensional transport among molecules adsorbed on a flat surface with transition moments randomly oriented on a cone of half-angle theta* from the surface normal. To test the effects of neglecting the residual polarization in solution transport, we generated anisotropic model fluorescence profiles using current transport theory coupled with a realistic simulation of residual polarization. These profiles were then deconvoluted under the assumption that residual polarization is absent. The resulting discrepancies are extremely small and are barely detectable under the best current photon-counting statistics recently used by us. The magnitude of the residual polarization in 2-dimensional transport depends on the adsorption angle theta* but is comparable to that in 3-dimensional transport.

• Research Organization: Iowa State Univ., Ames
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5954286
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:19; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
DATA
EMISSION SPECTRA
ENERGY TRANSFER
FLUORESCENCE
INFORMATION
LUMINESCENCE
MOLECULES
NUMERICAL DATA
POLARIZATION
QUANTITY RATIO
SPECTRA
THEORETICAL DATA
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS