title: Role of diffusion in excitation energy transfer and migration.
abstract: Effect of diffusion on excitation energy transfer and migration in a dye pair sodium fluorescein (donor) and Rhodamine-6G (acceptor) has been studied for different viscosities by both steady state and time domain fluorescence spectroscopic measurements. The donor-donor interaction appears to be weaker as compared to donor-acceptor interaction and thus favors direct Forster-type energy transfer. Interestingly, at low viscosity (water in this case) transfer appears to be controlled by material diffusion/energy migration. Further, acceptor dynamics reveals the fact that direct Forster transfer dominates in viscous media.
authors.affiliation: Photophysics Laboratory, Department of Physics, Kumaon University, Nainital 263 001, India.
authors.forename: V
authors.initials: V
authors.lastname: Misra
authors.forename: H
authors.initials: H
authors.lastname: Mishra
mesh_terms: D003198:Computer Simulation; D004058:Diffusion; D004579:Electron Transport; D004735:Energy Transfer; D019793:Fluorescein / Q000737:chemistry*; D008956:Models, Chemical; D008958:Models, Molecular; D012235:Rhodamines / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*