56 research outputs found
Electromodulated photoinduced absorption : A new spectroscopy in π- conjugated polymer/C60 blends
Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United StatesMartin Liess, Paul A. Lane, Zakya H. Kafafi, M. Hamaguchi, Masanori Ozaki, Katsumi Yoshino, and Z. Valy Vardeny "Electromodulated photoinduced absorption: a new spectroscopy in π-conjugated polymer/C60 blends", Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997). DOI: https://doi.org/10.1117/12.29335
Optical absorption spectra of A6C60 and A6C70: Reduction of effective Coulomb interactions in Frenkel excitons
We theoretically investigate optical absorption spectra of \soc^{6-} and
\rug^{6-}, and discuss relations with the optical properties of alkali metal
doped fullerides A_6\soc and A_6\rug. This is a valid approach for systems
where Frenkel exciton effects are dominant. We use a tight binding model with
long ranged Coulomb interactions and bond disorder. Optical spectra are
obtained by the Hartree-Fock approximation and the configuration interaction
method. We find that the Coulomb interaction parameters, which are relevant to
the optical spectra of A_6\soc (A_6\rug) in order to explain the excitation
energies and relative oscillator strengths of absorption peaks, are almost the
half of those of the neutral \soc (\rug). The reduction of the effective
Coulomb interactions is concluded for the heavily doped case of \soc and
\rug. This finding is closely related with the experimental fact that
dielectric constants of fullerides which are maximumly doped with alkali metals
become about twice as large as those of the neutral systems.Comment: Note: A full preprint with figures should be requested to the author.
It will be sent by air-mail.; E-mail: [email protected]
Matrix-Isolation Studies of the Reactions of Ground- and Excited-State Atomic Iron with Cyclopropane
Spectral Dispersion of Third-Harmonic Generation in Thin Films Containing Transition Metal Complexes
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