Studies of photoexcited states in polyacetylene and poly(paraphenylenevinylene) by absorption detected magnetic resonance : the case of neutral photoexcitations

Photoexcited states in {ital trans}polyacetylene ({ital t}-(CH){sub {ital x}}), and in alkoxy derivatives of poly(paraphenylenevinylene) (PPV) nondegenerate ground-state polymers, have been studied by the technique of absorption detected magnetic resonance. In addition to the stable {ital charged} p...

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Bibliographic Details
Published in:Physical review letters 1992-02, Vol.68 (5), p.666-669
Main Authors: WEI, X, HESS, B. C, VARDENY, Z. V
Format: Article
Language:English
Subjects:
360606 - Other Materials- Physical Properties- (1992-)
ABSORPTIVITY
CHARGE STATE
Condensed matter: electronic structure, electrical, magnetic, and optical properties
ELECTRIC CONDUCTORS
ENERGY LEVELS
Exact sciences and technology
EXCITED STATES
HYDROCARBONS
MAGNETIC RESONANCE
MATERIALS SCIENCE
OPTICAL PROPERTIES
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
ORGANIC COMPOUNDS
PHOTO-INDUCED TRANSIENT SPECTROSCOPY
PHYSICAL PROPERTIES
Physics
POLYACETYLENES
POLYENES
POLYMERS
QUASI PARTICLES
RELAXATION
RESONANCE
SPECTROSCOPY
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Summary:Photoexcited states in {ital trans}polyacetylene ({ital t}-(CH){sub {ital x}}), and in alkoxy derivatives of poly(paraphenylenevinylene) (PPV) nondegenerate ground-state polymers, have been studied by the technique of absorption detected magnetic resonance. In addition to the stable {ital charged} photoexcitations, which are charged solitons in {ital t}-(CH){sub {ital x}} and bipolarons in PPV, we clearly identify {ital neutral} photoexcitations with {ital nonzero} spins. In {ital t}-(CH){sub {ital x}} these are spin-1/2 neutral solitons {ital S}{sup 0}({ital {bar S}} {sup 0}) with an optical transition at 1.35 eV. The neutral photoexcitations in PPV form triplet excitons which cannot dissociate into {ital S}{sup 0}{ital {bar S}} {sup 0} pairs due to the confinement caused by the nondegenerate backbone structure.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.68.666