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Titolo:
PHOTOFRAGMENTATION OF CHLOROTOLUENES AND DICHLOROBENZENES - SUBSTITUENT EFFECTS ON THE DISSOCIATION MECHANISM, AND ANGULAR-DISTRIBUTION OF THE CL FRAGMENT
Autore:
ICHIMURA T; MORI Y; SHINOHARA H; NISHI N;
Indirizzi:
TOKYO INST TECHNOL,DEPT CHEM,MEGURO KU TOKYO 152 JAPAN NAGOYA UNIV,DEPT CHEM,CHIGUSA KU NAGOYA AICHI 46401 JAPAN INST MOL SCI OKAZAKI AICHI 444 JAPAN
Titolo Testata:
The Journal of chemical physics
fascicolo: 3, volume: 107, anno: 1997,
pagine: 835 - 842
SICI:
0021-9606(1997)107:3<835:POCAD->2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
NO2 PHOTODISSOCIATION; PHOTO-DISSOCIATION; INTERNAL-ROTATION; MOLECULAR-BEAMS; P-FLUOROTOLUENE; SPECTRA; DYNAMICS; 193-NM; VAPOR; STATE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
T. Ichimura et al., "PHOTOFRAGMENTATION OF CHLOROTOLUENES AND DICHLOROBENZENES - SUBSTITUENT EFFECTS ON THE DISSOCIATION MECHANISM, AND ANGULAR-DISTRIBUTION OF THE CL FRAGMENT", The Journal of chemical physics, 107(3), 1997, pp. 835-842

Abstract

Time-of-flight spectra of the Cl photofragments were measured for molecular beams of o-, m-, and p-chlorotoluene (ClC6H4CH3) and o-, m-, and p-dichlorobenzene (ClC6H4Cl) irradiated by a 193 nm excimer laser pulse. The observed translational energy distributions of photofragmentsrevealed that these chlorinated benzene derivatives dissociate via three-different channels: (1) very fast predissociation and/or a direct dissociation, (2) predissociation through the triplet state, and (3) predissociation via highly excited vibrational levels of the ground electronic state (hot molecules). The three dissociation channels for dichlorobenzene have similar probabilities (similar to 0.3) in accord with those for chlorobenzene, indicating no significant change caused by the additional chlorine atom. The methyl substituent on chlorobenzene (chlorotoluene), however, remarkably induces dissociation through triplet states, probably due to the enhanced intersystem crossing by the methyl group. The angular distribution of the photofragment was also measured for p-chlorotoluene and p-dichlorobenzene excited by linearly polarized laser light, Angular distributions of the Cl fragments via the 2nd and 3rd channels were isotropic, while the fastest fragment via the Ist channel has an anisotropic distribution, confirming that the dissociation rate of the 1st channel is shorter thana molecular rotation. (C) 1997 American Institute of Physics.

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Documento generato il 28/03/20 alle ore 23:08:26