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Titolo:
Photopolymerization and thermal decomposition of polymerized phase in C-60crystals under strong laser illumination
Autore:
Sakai, M; Ichida, M; Nakamura, A;
Indirizzi:
Nagoya Univ, Dept Crystalline Mat Sci, Chikusa Ku, Nagoya, Aichi 4648603, Japan Nagoya Univ Nagoya Aichi Japan 4648603 a Ku, Nagoya, Aichi 4648603, Japan Nagoya Univ, Ctr Integrated Res Sci & Engn, Chikusa Ku, Nagoya, Aichi 4648603, Japan Nagoya Univ Nagoya Aichi Japan 4648603 a Ku, Nagoya, Aichi 4648603, Japan
Titolo Testata:
FULLERENE SCIENCE AND TECHNOLOGY
fascicolo: 3, volume: 9, anno: 2001,
pagine: 351 - 361
SICI:
1064-122X(2001)9:3<351:PATDOP>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
DETECTED MAGNETIC-RESONANCE; SINGLE-CRYSTALS; FULLERENE C-60; SOLID FILMS; OPTICAL-ABSORPTION; RAMAN-SCATTERING; PHOTOLUMINESCENCE; FLUORESCENCE; C-70; C60;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Sakai, M Nagoya Univ, Dept Crystalline Mat Sci, Chikusa Ku, Nagoya, Aichi 4648603, Japan Nagoya Univ Nagoya Aichi Japan 4648603 oya, Aichi 4648603, Japan
Citazione:
M. Sakai et al., "Photopolymerization and thermal decomposition of polymerized phase in C-60crystals under strong laser illumination", FUL SCI TEC, 9(3), 2001, pp. 351-361

Abstract

We have investigated the photopolymerization and thermal decomposition of photochemical products with high density excitation (11-480 mW/mm(2)) by means of time-gated Raman scattering experiments in C-60 single crystal. The temperature of laser-illuminated area was measured by Stokes and anti-Stokes Raman scattering of C-60 Hg(1) mode, which shows the local temperature rise with increase of laser power density. The Raman intensity of Ag(2) mode rapidly decreases with irradiation time for I < 170 mW/mm(2) indicating therapid decrease in C-60 monomer density due to photopolymerization. For higher power densities, however, the Raman intensity increases after showing aminimum, which suggests a dissociation of photopolymers. The results are well explained by the rate equation model taking into account photochemical generation and thermal decomposition of photo-produced dimers. These results indicate the strong laser illumination simultaneously induces the photopolymerization and thermal decomposition.

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Documento generato il 28/09/20 alle ore 15:40:39