Photodissociation dynamics of the tert-butyl radical via photofragment translational spectroscopy at 248 nm
Identifieur interne : 004331 ( PascalFrancis/Curation ); précédent : 004330; suivant : 004332Photodissociation dynamics of the tert-butyl radical via photofragment translational spectroscopy at 248 nm
Auteurs : Bogdan Negru [États-Unis] ; Gabriel M. P. Just [États-Unis] ; Dayoung Park [États-Unis] ; Daniel M. Neumark [États-Unis]Source :
- PCCP. Physical chemistry chemical physics : (Print) [ 1463-9076 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Butane.
English descriptors
- KwdEn :
Abstract
The photodissociation dynamics of the tert-butyl radical (t-C4H9) were investigated using photofragment translational spectroscopy. The tert-butyl radical was produced from flash pyrolysis of azo-tert-butane and dissociated at 248 nm. Two distinct channels of approximately equal importance were identified: dissociation to H + 2-methylpropene, and CH3 + dimethylcarbene. Neither the translational energy distributions that describe these two channels nor the product branching ratio are consistent with statistical dissociation on the ground state, and instead favor a mechanism taking place on excited state surfaces.
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<term>Dissociation</term>
<term>Dynamics</term>
<term>Energy distribution</term>
<term>Excited state</term>
<term>Ground state</term>
<term>Mechanism</term>
<term>Photodissociation</term>
<term>Pyrolysis</term>
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<term>Dynamique</term>
<term>Pyrolyse</term>
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<term>Dissociation</term>
<term>Energie translationnelle</term>
<term>Distribution énergie</term>
<term>Rapport branchement</term>
<term>Etat fondamental</term>
<term>Mécanisme</term>
<term>Etat excité</term>
<term>3380G</term>
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<front><div type="abstract" xml:lang="en">The photodissociation dynamics of the tert-butyl radical (t-C<sub>4</sub>
H<sub>9</sub>
) were investigated using photofragment translational spectroscopy. The tert-butyl radical was produced from flash pyrolysis of azo-tert-butane and dissociated at 248 nm. Two distinct channels of approximately equal importance were identified: dissociation to H + 2-methylpropene, and CH<sub>3</sub>
+ dimethylcarbene. Neither the translational energy distributions that describe these two channels nor the product branching ratio are consistent with statistical dissociation on the ground state, and instead favor a mechanism taking place on excited state surfaces.</div>
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H<sub>9</sub>
) were investigated using photofragment translational spectroscopy. The tert-butyl radical was produced from flash pyrolysis of azo-tert-butane and dissociated at 248 nm. Two distinct channels of approximately equal importance were identified: dissociation to H + 2-methylpropene, and CH<sub>3</sub>
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</fC01>
<fC02 i1="01" i2="X"><s0>001C01</s0>
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<s5>01</s5>
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<s5>01</s5>
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<s5>02</s5>
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<s5>02</s5>
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<s5>02</s5>
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<s5>03</s5>
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<s5>04</s5>
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<s2>NK</s2>
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<s5>05</s5>
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<s5>05</s5>
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<s5>07</s5>
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<s5>09</s5>
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<s5>10</s5>
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<s5>10</s5>
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<s5>10</s5>
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<s5>11</s5>
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<s5>11</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>3380G</s0>
<s4>INC</s4>
<s5>32</s5>
</fC03>
<fN21><s1>192</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
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