Radiation Chemistry of Luminescent Solutions

Burton, Milton; Patrick, W. N.

doi:10.1063/1.1740309

Cited by 9 publications

(3 citation statements)

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“…Another alternative for the production of biphenyl is an ion−molecule reaction of the parent cation with benzene. This reaction is expected to be slow, but the yield of biphenyl is small and probably due to a minor process like this …”

Section: Resultsmentioning

confidence: 99%

“…The latter are not expected to be significant in benzene . Scavenger studies with m -terphenyl and iodine show that very high solute concentrations are required to lower molecular hydrogen yields in the radiolysis with low LET radiation. , At 0.2 M iodine, the molecular hydrogen yield is decreased 23% with γ-rays . If a rate constant of 1.2 × 10 10 M -1 s -1 is assumed for H atom reaction with iodine, the scavenging capacity for this reaction at 0.2 M iodine, 2.4 × 10 9 s -1 , is not fast enough to compete significantly with H atom addition to benzene 1.2 × 10 10 s -1 (11.2 M × 1.1 × 10 9 M -1 s -1 ).…”

Section: Resultsmentioning

confidence: 99%

“…This reaction is expected to be slow, but the yield of biphenyl is small and probably due to a minor process like this. 37 Molecular Hydrogen Production. Molecular hydrogen is one of the most examined products in the radiolysis of benzene, especially at high LET.…”

Section: Resultsmentioning

confidence: 99%

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Heavy Ion Radiolysis of Liquid Benzene

LaVerne

Araos

2002

J. Phys. Chem. A

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The mechanisms responsible for the main products in liquid benzene radiolysis (biphenyl, molecular hydrogen, and phenyl radical) are probed with protons, helium ions, and carbon ions of a few to 30 MeV energy. Phenyl radical yields have been examined using iodine scavenging techniques. The results are combined with similar data for γ-rays and suggest that phenyl radicals mainly react with benzene to give a long-lived adduct, which leads to polymer formation. Iodine can react with this adduct to give enhanced yields of biphenyl. Biphenyl is the predominant single hydrocarbon product in the radiolysis of neat benzene with a yield of 0.075 molecule/100 eV. Its yield is nearly independent of radiation type and energy suggesting that its formation in neat benzene is due to a fast ion−molecule process and not due to phenyl radicals. The total yield of 0.7 radicals/100 eV is almost entirely due to phenyl radicals and H atoms. A reexamination of the fluorescence from the singlet excited state of benzene suggests that this state is the precursor for molecular hydrogen and acetylene, whereas the triplet excited state decays to phenyl radicals and H atoms. Most of the excited states formed in the γ-radiolysis of benzene seem to decay to ground without formation of any product.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Heavy Ion Radiolysis of Liquid Benzene

LaVerne

Araos

2002

J. Phys. Chem. A

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X₁. Zwischenmolekularer Übergang von Elektronenanregungsenergie

Förster

1960

Zeitschrift für Elektrochemie, Berichte der Bunsengesellschaft

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The studies of sensitized fluorescence in gases and liquids arc discussed, and the possibility of detecting an nontrivial transfer of electronic energy considered. The elementary process of excitation transfer between molecules in thermal equilibrium with their environment is quantitatively treated for pure dipole‐dipole coupling and discussed qualitatively for other cases. The theorie of the elementary process is applied to solutions with statistical distributions of molecules. The transfer between like molecules can occur in several steps. Recent research at very low temperatures can be taken as evidence that such processes are important for the fluorescence of foreign molecules in molecular cristals.

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Strahlungschemie von Kohlenwasserstoffen. 14. Mitteilung. Mögliche Radikalreaktionen in Benzol

Zimmerli¹,

Gäumann²

1969

Helvetica Chimica Acta

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The behaviour of benzene and its mixtures with naphthalene, anthracene, cyclohexene and cyclohexadienes under the influence of γ‐irradiation is examined. A mechanism of the product formation in pure benzene is proposed and discussed, that is mainly based on radical reactions between cyclohexadienyl and phenylcyclohexadienyl radicals. The existence of phenyl radicals is shown by the formation of phenylnaphthalenes with naphthalene as additive. The inhibiting effect of cyclohexene and cyclohexadiene on the biphenyl and phenylcyclohexadiene formation can be explained by hydrogen abstraction by the phenyl radicals.

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Radiation Chemistry of Luminescent Solutions

Cited by 9 publications

References 5 publications

Heavy Ion Radiolysis of Liquid Benzene

Heavy Ion Radiolysis of Liquid Benzene

X₁. Zwischenmolekularer Übergang von Elektronenanregungsenergie

Strahlungschemie von Kohlenwasserstoffen. 14. Mitteilung. Mögliche Radikalreaktionen in Benzol

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Radiation Chemistry of Luminescent Solutions

Cited by 9 publications

References 5 publications

Heavy Ion Radiolysis of Liquid Benzene

Heavy Ion Radiolysis of Liquid Benzene

X1. Zwischenmolekularer Übergang von Elektronenanregungsenergie

Strahlungschemie von Kohlenwasserstoffen. 14. Mitteilung. Mögliche Radikalreaktionen in Benzol

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X₁. Zwischenmolekularer Übergang von Elektronenanregungsenergie