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Titolo:
Second-harmonic generation interferometry for the determination of molecular orientation in Langmuir monolayers
Autore:
Nakano, T; Yamada, S;
Indirizzi:
Kyushu81,iv, Grad Sch Engn, Dept Mat Phys & Chem, Higashi Ku, Fukuoka 81285 Kyushu Univ Fukuoka Japan 8128581 Phys & Chem, Higashi Ku, Fukuoka 81285
Titolo Testata:
BUNSEKI KAGAKU
fascicolo: 12, volume: 47, anno: 1998,
pagine: 979 - 984
SICI:
0525-1931(199812)47:12<979:SGIFTD>2.0.ZU;2-K
Fonte:
ISI
Lingua:
JPN
Soggetto:
2ND-HARMONIC GENERATION; LIQUID INTERFACES; INTERFERENCE; SPECTROSCOPY; SUBSTRATE; FILMS; PROBE; ORDER; PHASE;
Keywords:
optical second-harmonic generation (SHG); air/water interface; monolayer; SHG interference; molecular orientation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Nakano, T Kyushuki,iv, Grad Sch Engn, Dept Mat Phys & Chem, Higashi Ku, 6-10-1 Hakoza Kyushu Univ 6-10-1 Hakozaki Fukuoka Japan 8128581 6-10-1 Hakoza
Citazione:
T. Nakano e S. Yamada, "Second-harmonic generation interferometry for the determination of molecular orientation in Langmuir monolayers", BUNSEKI KAG, 47(12), 1998, pp. 979-984

Abstract

The technique of optical second-harmonic generation (SHG) interference wasapplied to evaluate the nonlinear polarization vector of a monolayer assembly at the air/water interface. Coherent interference patterns of second-harmonic (SH) waves from a sample monolayer and a reference SHG-active material were clearly observed. Interference patterns were compared with three SHG-active amphiphilic dyes: ruthenium complex, stilbazole and hemicyanine dyes. The ruthenium complex and the hemicyanine dyes afforded almost identical interference patterns of SH waves, indicating the same sign of the nonlinear polarization vector in the monolayers with respect to the water surface. In spite of the fact that the stilbazole and the hemicyanine dyes have the same SHG-active moiety, an almost 180 degrees phase shift of the interference patterns was observed. This result shows that the nonlinear polarization vector of the stilbazole monolayer is oppositely directed to that of thehemicyanine monolayer.

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Documento generato il 05/07/20 alle ore 00:17:01