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Multiphoton Spectra of Conjugated Polymers

Published online by Cambridge University Press:  25 February 2011

Z. G. Soos ,
S. Etemad  and
R. G. Kepler
Z. G. Soos
Affiliation:
Department of Chemistry, Princeton University, Princeton, NJ 08544
S. Etemad
Affiliation:
Bell Telecommunications Research, Red Bank, NJ 07701
R. G. Kepler
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185
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Abstract

Multiphoton excitations of conjugated polymers are related to their optical gap, Eg, which serves as an internal standard. In π-electron models with electron-hole symmetry, the alternation gap Ea is the lowest-energy two-photon absorption (TPA) and increases with the alternation δ of the transfer integrals t(l ± δ) along the backbone. Increasing electron-electron (e-e) correlations shift an intense TPA from 2Eg in the band limit to Eg in the atomic limit. Two-photon spectra and multiphoton resonances in polyenes, polydiacetylenes, and polysilanes are related to interacting electrons in Pariser-Parr-Pople(PPP) models with increasing alternation and either carbon or silicon e-e interactions. Some general features of correlated states of conjugated polymers are discussed in the rigid-lattice limit.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 79
Copyright
Copyright © Materials Research Society 1992

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