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Photodissociation dynamics of the 2-propyl radical, C 3 H 7
The photodissociation of 2-propyl leading to propene + H was investigated with nanosecond time resolution. A supersonic beam of isolated 2-propyl radicals was produced by pyrolysis of 2-bromopopane. The kinetic energy release of the H-atom photofragment was monitored as a function of excitation wave...
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Published in: | The Journal of chemical physics 2007-04, Vol.126 (14), p.144302-144302-6 |
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Main Authors: | , |
Format: | Article |
Language: | |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | The photodissociation of 2-propyl leading to
propene
+
H
was investigated with nanosecond time resolution. A supersonic beam of isolated 2-propyl radicals was produced by pyrolysis of 2-bromopopane. The kinetic energy release of the H-atom photofragment was monitored as a function of excitation wavelength by photofragment Doppler spectroscopy via the Lyman-
α
transition. The loss of hydrogen atoms after excitation proceeds in
α
position to the radical center with a rate constant of
5.8
×
10
7
s
−
1
at
254
nm
. Approximately 20% of the excess energy is deposited as translation in the H-atom photofragment. In contrast 1-propyl does not lose H atoms to a significant extent. The experimental results are compared to simple Rice-Ramsperger-Kassel-Marcus calculations. The possible reaction pathways are examined in hybrid density functional theory calculations. |
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ISSN: | 0021-9606 1089-7690 |
DOI: | 10.1063/1.2715917 |