Laeuter, Almuth ; Volpp, Hans-Robert ; Mittal, Jai P. ; Vatsa, Rajesh K. (2007) Lyman-α photodissociation of CH3CFCl2 (HCFC-141b): quantum yield and translational energy of hydrogen atoms Journal of Chemical Sciences, 119 (4). pp. 277-282. ISSN 0253-4134
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Official URL: http://www.ias.ac.in/chemsci/Pdf-Jul2007/277-282.p...
Related URL: http://dx.doi.org/10.1007/s12039-007-0036-2
Abstract
The collision-free, room temperature gas-phase photodissociation dynamics of CH3CFCl2 (HCFC-141b) was studied using Lyman-α laser radiation (121.6 nm) by the laser photolysis/laser-induced fluorescence 'pump/probe' technique. Lyman-α radiation was used both to photodissociate the parent molecule and to detect the nascent H atom products via (2p 2P → 1s 2S) laser-induced fluorescence. Absolute H atom quantum yield, ΦH = (0.39 ± 0.09) was determined by calibration method in which CH4 photolysis at 121.6 nm was used as a reference source of well-defined H atom concentrations. The line shapes of the measured H atom Doppler profiles indicate a Gaussian velocity distribution suggesting the presence of indirect H atom formation pathways in the Lyman-α photodissociation of CH3CFCl2. The average kinetic energy of H atoms calculated from Doppler profiles was found to be E T(lab) = (50 ± 3) kJ/mol. The nearly statistical translational energy together with the observed Maxwell-Boltzmann velocity distribution indicates that for CH3CFCl2 the H atom forming dissociation process comes closer to the statistical limit.
Item Type: | Article |
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Source: | Copyright of this article belongs to Indian Academy of Sciences. |
Keywords: | CH3CFCl2; Photodissociation; Lyman-α; Laser-induced Fluorescence |
ID Code: | 25832 |
Deposited On: | 04 Dec 2010 11:33 |
Last Modified: | 17 May 2016 09:15 |
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