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Titolo:
METHYL INTERNAL-ROTATION OF PHOTOEXCITED CHLOROTOLUENE MOLECULES
Autore:
KOJIMA H; SAKEDA K; SUZUKI T; ICHIMURA T;
Indirizzi:
TOKYO INST TECHNOL,DEPT CHEM,MEGURO KU TOKYO 152 JAPAN TOKYO INST TECHNOL,DEPT CHEM,MEGURO KU TOKYO 152 JAPAN
Titolo Testata:
The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory
fascicolo: 45, volume: 102, anno: 1998,
pagine: 8727 - 8733
SICI:
1089-5639(1998)102:45<8727:MIOPCM>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTRAMOLECULAR VIBRATIONAL REDISTRIBUTION; P-FLUOROTOLUENE; PHOTOFRAGMENTATION; ACCELERATION; FRAGMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
H. Kojima et al., "METHYL INTERNAL-ROTATION OF PHOTOEXCITED CHLOROTOLUENE MOLECULES", The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 102(45), 1998, pp. 8727-8733

Abstract

Laser-induced fluorescence excitation and dispersed fluorescence spectra of jet-cooled chlorotoluene molecules were measured. Weak bands were observed near the origin for p- and m-chlorotoluene, and assigned to be the internal rotation of the methyl group in the S-0 and S-1 states. Internal rotational levels observed in the spectra were well reproduced by periodic potential with a free rotor basis set. The potentialbarrier heights for the S-0 and S-1 states of p-chlorotoluene are quite low, suggesting that the methyl rotor is almost free in both states. When m-chlorotoluene changes from the S-0 to the S-1 states, the potential barrier height increases, revealing that the methyl rotor is hindered in the S-1 state. For o-chlorotoluene, no internal rotational bands were observed, probably because of the large steric hindrance and/or the electronic properties of the Cl substituent. The contribution of the methyl internal rotation to the nonradiative processes is discussed using a comparison between the observed intensities and the Franck-Condon factors.

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Documento generato il 01/06/20 alle ore 06:21:26