Accession Number : ADA175488


Title :   Contribution of Dipolar Coupling to the Mechanism of the Triplet-Triplet Energy Transfer Process at Long Distances: A Doluble Resonance and Laser Line Narrowing Study.


Descriptive Note : Technical rept.,


Corporate Author : CALIFORNIA UNIV LOS ANGELES DEPT OF CHEMISTRY AND BIOCHEMISTRY


Personal Author(s) : Morgan,Jack R ; Niederwald,Hansjorg S ; Yang,Chan-Lon ; El-Sayed,M A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a175488.pdf


Report Date : 16 Dec 1986


Pagination or Media Count : 29


Abstract : The results of the temporal behavior of the phosphorescence emission are analyzed when excited at different laser frequencies within the inhomogeneous linewidth of the 0,0 band of the singlet triplet absorption of an orientationally disordered solid (1-bromo-4-chloronaphthalene) at 4.2 K. This enabled the examination of the triplet triplet energy transfer probability as a function of the donor acceptor distance by simply changing the laser frequency. The deviation from the expected temporal behavior for the electron times or large donor acceptor distances is discussed in terms of either a contribution of dipolar coupling to the transfer mechanism or a change in the dimensionality of the system undergoing the transfer process. Results of the phosphorescence microwave double resonance techniques could lend support to the possibility of a contribution of the dipolar coupling to the triplet triplet transfer at large donor acceptor distances (i.e., long wavelength laser excitation). Keywords: Energy Transfer; Double Resonance; Laser Line Narrowing; Disordered Solids; Dimensionality.


Descriptors :   *EMISSION SPECTRA , *RESONANCE RADIATION , *PHOSPHORESCENCE , COUPLING(INTERACTION) , FREQUENCY , LASER PUMPING , EXCITATION , ORDER DISORDER TRANSFORMATIONS , ENERGY TRANSFER , SOLIDS , LASERS , LONG RANGE(DISTANCE) , RESONANCE , DIPOLES , TRANSFER , RANGE(DISTANCE) , LONG WAVELENGTHS , ELECTRON ACCEPTORS , NAPHTHALENES


Subject Categories : Organic Chemistry
      Radiation and Nuclear Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE