Yields of excited states of solutes in irradiated benzene and cyclohexane

Journal Article · Thu Sep 13 04:00:00 EDT 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150663a012· OSTI ID:6154767

Choi, H T; Hirayama, F; Lipsky, S

The yields of lowest excited singlet states of diphenyloxazole and p-terphenyl in benzene and of diphenyloxazole, p-terphenyl, and biphenyl in cyclohexane have been measured for excitation by using /sup 85/Kr ..beta.. particles. The dependence of the yield on solute concentration for benzene solutions is shown to be accurately represented by a Stern-Volmer function from 5 x 10/sup -4/ to 10/sup -2/ M and to extrapolate at infinite solute concentration to the yield of excited singlet states of neat liquid benzene. The presence of oxygen in the solution does not affect the extrapolation. The absolute efficiencies of energy transfer from irradiated benzene to the solutes are in good agreement with previous measurements made by using optical excitation below the ionization threshold. These results provide additional confirmation that the mechanism of formation of excited solute states in fast-electron-irradiated benzene does not significantly involve electron or hole capture by the solute. They also demonstrate that the inhomogeneity of energy deposition does not affect the ratio of probabilities of the decay of excited benzene by photon emission to its decay by nonradiative energy transfer to the solute. For cyclohexane solutions, it is confirmed that the yields of excited solute states are lower than in benzene solutions at comparable concentration, but larger than would be expected were the same nonionic mechanism to apply as it does in benzene. The consequences of these conclusions are discussed.

• Research Organization: Univ. of Minnesota, Minneapolis
• OSTI ID: 6154767
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:19; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ALKANES
AROMATICS
AZOLES
BENZENE
BETA DECAY RADIOISOTOPES
BETA PARTICLES
BETA-MINUS DECAY RADIOISOTOPES
BIPHENYL
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COMPARATIVE EVALUATIONS
CYCLOALKANES
CYCLOHEXANE
DATA
DATA ANALYSIS
DECOMPOSITION
ENERGY LEVELS
ENERGY TRANSFER
EVEN-ODD NUCLEI
EXCITED STATES
EXPERIMENTAL DATA
EXTRAPOLATION
G VALUE
HETEROCYCLIC COMPOUNDS
HOURS LIVING RADIOISOTOPES
HYDROCARBONS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
KRYPTON 85
KRYPTON ISOTOPES
NUCLEI
NUMERICAL DATA
NUMERICAL SOLUTION
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC SOLVENTS
OXAZOLES
POLYPHENYLS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOISOTOPES
RADIOLYSIS
SOLVENTS
TERPHENYL-PARA
TERPHENYLS
YEARS LIVING RADIOISOTOPES