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Titolo:
Electro-optical studies of a soluble conjugated polymer with particularly low intrachain disorder
Autore:
Harrison, MG; Moller, S; Weiser, G; Urbasch, G; Mahrt, RF; Bassler, H; Scherf, U;
Indirizzi:
Univ Marburg, Dept Phys, Inst Chem Phys, D-35032 Marburg, Germany Univ Marburg Marburg Germany D-35032 Chem Phys, D-35032 Marburg, Germany Univ Marburg, Ctr Mat Sci, D-35032 Marburg, Germany Univ Marburg MarburgGermany D-35032 r Mat Sci, D-35032 Marburg, Germany Max Planck Inst Polymer Res, D-55128 Mainz, Germany Max Planck Inst Polymer Res Mainz Germany D-55128 D-55128 Mainz, Germany
Titolo Testata:
PHYSICAL REVIEW B-CONDENSED MATTER
fascicolo: 12, volume: 60, anno: 1999,
pagine: 8650 - 8658
SICI:
0163-1829(19990915)60:12<8650:ESOASC>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
SITE-SELECTIVE FLUORESCENCE; ELECTROABSORPTION SPECTROSCOPY; LADDER POLYMER; PARA-PHENYLENE; BETA-CAROTENE; PPP-TYPE; SPECTRA; POLY(P-PHENYLENE); ABSORPTION; EXCITONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Harrison, MG Univ Marburg, Dept Phys, Inst Chem Phys, D-35032 Marburg, Germany Univ Marburg Marburg Germany D-35032 35032 Marburg, Germany
Citazione:
M.G. Harrison et al., "Electro-optical studies of a soluble conjugated polymer with particularly low intrachain disorder", PHYS REV B, 60(12), 1999, pp. 8650-8658

Abstract

In contrast with many soluble conjugated polymers, the absorption and electroabsorption spectra of the methyl-substituted ladder-type poly(para-phenylene) show particularly well-resolved excitonic transitions, whose linewidth approaches the narrow values previously only associated with single crystals or isolated chains of polydiacetylenes. At feast two distinct vibrational modes couple strongly to the electronic transitions. The electroabsorption spectrum increases quadratically with the electric-held strength, and closely follows the first derivative of absorption throughout most of the visible and near-ultraviolet range, indicative of a quadratic Stark shift of the 1B(u) singlet exciton. In the region 3.2-3.6 eV, the agreement between the electroabsorption spectrum and the first derivative is offset by a broader spectral feature, which does not correspond to any feature in the Linearabsorption spectrum. Two-photon fluorescence excitation spectroscopy identifies this state as a forbidden exciton (mA(g)), located 0.7 eV above the lowest singlet exciton (1B(u)). A polarizability of 2060 Angstrom(3) and a dipole moment of 7.17e Angstrom ( 34D) is calculated for the 1 B-u singlet exciton. The spectra show evidence of a small increase of the vibrational frequencies as the polarization of the pi system increases.

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Documento generato il 01/12/20 alle ore 13:12:54