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UV-visible spectrum of the phenyl radical and kinetics of its reaction with NO in the gas phase

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Pulse radiolysis transient UV-visible absorption spectroscopy was used to study the UV-visible absorption spectrum (225-575 nm) of the phenyl radical, C6H5(·), and kinetics of its reaction with NO. Phenyl radicals have a strong broad featureless absorption in the region of 225-340 nm. In the presence of NO phenyl radicals are converted into nitrosobenzene. The phenyl radical spectrum was measured relative to that of nitrosobenzene. Based upon σ(C6H5NO)270 nm = 3.82 × 10-17 cm2 molecule-1 we derive an absorption cross-section for phenyl radicals at 250 nm, σ(C6H5(·))250 nm = (2.75 ± 0.58) × 10-17 cm2 molecule-1. At 295 K in 200-1000 mbar of Ar diluent k(C6H5(·) + NO) = (2.09 ± 0.15) × 10-11 cm3 molecule-1 s-1.

OriginalsprogEngelsk
TidsskriftChemical Physics Letters
Vol/bind290
Udgave nummer4-6
Sider (fra-til)363-370
Antal sider8
ISSN0009-2614
DOI
StatusUdgivet - 1 jan. 1998

ID: 225755328