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Titolo:
Enhancement of third-order nonlinear response in excited state of metallophthalocyanines (PcM; M = H-2, Mg, Ni)
Autore:
Cheng, WD; Wu, DS; Zhang, H; Chen, JT;
Indirizzi:
Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fujian 350002, Peoples R China Chinese Acad Sci Fujian Peoples R China 350002 n 350002, Peoples R China
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 45, volume: 105, anno: 2001,
pagine: 11221 - 11226
SICI:
1520-6106(20011115)105:45<11221:EOTNRI>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSITION-METAL COMPLEXES; LIGHT-HARVESTING PROTEINS; OPTICAL PROPERTIES; 3RD-HARMONIC GENERATION; ELECTRONIC EXCITATIONS; INTERMEDIATE NEGLECT; PHTHALOCYANINES; SPECTROSCOPY; POLYENES; BACTERIOCHLOROPHYLLS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Cheng, WD Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fujian 350002, Peoples R China Chinese Acad Sci Fujian Peoples R China 350002 Peoples R China
Citazione:
W.D. Cheng et al., "Enhancement of third-order nonlinear response in excited state of metallophthalocyanines (PcM; M = H-2, Mg, Ni)", J PHYS CH B, 105(45), 2001, pp. 11221-11226

Abstract

In this paper we calculate the dynamic third-order nonlinear optical polarizabilities of three optical processes, third-harmonic generation, electric-field-induced second-harmonic generation, and degenerate four-wave mixing,for both ground and first excited singlet states in metal phthalocyanines in terms of the sum-over states formula. The transition moment elements andthe transition energies in this formula are obtained using the INDO-SDCI method. The calculated second-order hypolarizabilities show a dispersion behavior with the difference from ground state and an enhancement of third-order nonlinear response in the first excited state. Among the PcM (M = H-2, Mg, Ni), there is a large enhancement of the first excited singlet state when there is a small third-order optical polarizability of the ground state. The calculated value of PcNi is compared with the observed one of the substituted PcNi in the order of magnitude. We also gain an understanding of enhancement mechanism for nonlinear processes in the excited state.

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Documento generato il 01/12/20 alle ore 00:42:41