| Autor: |
Wada, Yoshiki, Tokura, Yoshinori, Koda, Takao |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 3/1/1987, Vol. 86 Issue 5, p3009, 12p |
| Abstrakt: |
A theoretical algorithm is presented for numerical calculation of quasimetallic reflection bands of molecular excitons by a unified model which takes account of exciton–intramolecular phonon coupling by the dynamical coherent potential approximation and the polariton effect (the directional dispersion effect) by an anisotropic dielectric tensor. This method is applied to analyze experimental quasimetallic reflection spectra of DCI (1-1’-diethyl 2-2’-cyanine iodide), TCNQ (tetracyanoquinodimethane), and CTIP [γ-cyclopropyl-bis(1,2,3’-trimethyl-indolenine-2-yl) pentamethinium tetrafluoroborate] crystals. From a comparison of experimental and calculated reflectivity spectra, important exciton parameters, such as the bandwidths and shapes of low dimensional density-of-states functions of excitons, have been estimated. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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