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Superradiance of J-Aggregated 2,2'-Cyanine Absorbed onto a Vesicle SurfacePhospholipid vesicles are used as substrates to form adsorbed aggregates of 2,2'-cyanine, also referred to as pseudoisocyanine (PIC). In this paper, we report photophysical parameters of two putative adsorbed aggregates species (cis- and trans-aggregates, relating to their makeup from mono-cis and all-transstereoisomers, respectively). Phase modulation picosecond fluorescence decay measurements reveal that superradiance and energy transfer are dominant features controlling photophysical processes. Superradiance, coherence size, energy transfer and exciton-phonon coupling are discussed for the two types of aggregates; as regards photophysical parameters, the fluorescence lifetimes, fluorescence quantum yields, and nonradiative rate constants are determined. It is suggested that structure plays the crucial role in excited state dynamics.
Document ID
19960003456
Acquisition Source
Headquarters
Document Type
Conference Paper
Authors
Akins, Daniel L.
(City Coll. of the City Univ. of New York NY, United States)
Ozcelik, Serdar
(City Coll. of the City Univ. of New York NY, United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1995
Publication Information
Publication: NASA. Langley Research Center, Second Annual Research Center for Optical Physics (RCOP) Forum
Subject Category
Optics
Accession Number
96N13465
Funding Number(s)
CONTRACT_GRANT: NSF HRD-93-53488
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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