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Titolo:
Picosecond anti-Stokes Raman excitation profiles as a method for investigating vibrationally excited transients
Autore:
Okamoto, H; Nakabayashi, T; Tasumi, M;
Indirizzi:
Univ Tokyo, Sch Sci, Res Ctr Spectrochem, Bunkyo Ku, Tokyo 113, Japan UnivTokyo Tokyo Japan 113 Ctr Spectrochem, Bunkyo Ku, Tokyo 113, Japan Univ Tokyo, Sch Sci, Dept Chem, Bunkyo Ku, Tokyo 113, Japan Univ Tokyo Tokyo Japan 113 h Sci, Dept Chem, Bunkyo Ku, Tokyo 113, Japan
Titolo Testata:
LASER CHEMISTRY
fascicolo: 1-4, volume: 19, anno: 1999,
pagine: 335 - 341
SICI:
0278-6273(1999)19:1-4<335:PAREPA>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
RELAXATION; SPECTRUM; STILBENE; STATE;
Keywords:
anti-Stokes Raman scattering; time-resolved Raman spectroscopy; resonance Raman excitation profiles; vibrational relaxation; intramolecular vibrational redistribution;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
4
Recensione:
Indirizzi per estratti:
Indirizzo: Okamoto, H Univ Tokyo, Sch Sci, Res Ctr Spectrochem, Bunkyo Ku, Tokyo 113,Japan Univ Tokyo Tokyo Japan 113 ochem, Bunkyo Ku, Tokyo 113, Japan
Citazione:
H. Okamoto et al., "Picosecond anti-Stokes Raman excitation profiles as a method for investigating vibrationally excited transients", LASER CHEM, 19(1-4), 1999, pp. 335-341

Abstract

A method for estimating vibrational quantum numbers of vibrationally excited transients in solution is proposed. In this method, we calculate anti-Stokes Raman excitation profiles (REPs) which are characteristic of the initial vibrational states involved in the Raman process, and compare them with observed anti-Stokes intensities. We have applied this method to vibrationally hot molecules of canthaxanthin in the So state and those of trans-stilbene in the S-1 state. For canthaxanthin, it has been found that the vibrationally excited transients are for the most part on the v = 1 level of the C= C stretching mode, and that excess vibrational energy is statistically distributed among all intramolecular vibrational modes. As for SI stilbene, vibrational transients are shown to be mostly on the v = 1 level for two vibrational modes examined, while the excess vibrational energy is probably localised on the olefinic C = C stretching mode.

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Documento generato il 15/07/20 alle ore 08:47:59