Journal of Physical Chemistry p. 6298 - 6302 (1992)
Update date:2022-08-11
Topics:
Shimada, Tetsuya
Ojima, Yuichi
Nakashima, Nobuaki
Izawa, Yasukazu
Yamanaka, Chiyoe
Toluene, p-xylene, deuterated p-xylene, and mesitylene under low-pressure conditions as well as p-xylene under high-pressure conditions were studied with a 158-nm laser.Rise curves of the photoproducts were observed by the method of nanosecond laser photolysis.The ground-state alkylbenzenes with an internal energy of 8 eV are formed by internal conversion following the laser excitation.The alkylbenzenes dissociate to the corresponding benzyl-type and phenyl-type radicals via the hot molecule state.The dissociaton rate constants were 9.3 (+/- 0.7) x 107 s-1, 1.5 (+/- 0.3) x 107 s-1, 4.6 (+/- 0.4) x 106 s-1, and 3.0 (+/- 0.9) x 106 s-1, respectively.Dissociation rate constants of the C-H bond in the methyl group of the alkylbenzenes were estimated from these results and compared with previous predictions.
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