Jacqueline Belloni

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Radiation chemistry dates from the discovery of radioactivity one century ago by H. Becquerel and P. and M. Curie. The complex phenomena induced by ionizing radiation have been explained progressively. At present, the methodology of radiation chemistry, particularly in the pulsed mode, provides a powerful means to study not only the early processes after(More)
Radiolytic synthesis of mixed AuIII/PdII solutions at different dose rates is examined. The evolution of the plasmon spectra and the local X-ray micro diffraction has been systematically studied as a function of irradiation dose and dose rate. At low dose rate, a bilayered cluster of Au core-Pd shell is characterized. Due to intermetal electron transfer(More)
The detailed kinetics of the multistep mechanism of the Au(III) ion reduction into gold clusters have been investigated by radiation chemistry methods in 2-propanol. In particular, a discussion on the steady state radiolysis dose-dependence of the yields concludes to a comproportionation reaction of nascent gold atoms Au(0) with excess Au(III) ions into(More)
The optical absorption spectra of Ag0, Ag2, transient oligomers, and stable clusters were studied in deaerated methanol by pulse and γ-radiolysis methods and compared with data obtained from studies using other solvents. From the decay of esolv at 620 nm, the formation rate constant of Ag0 was determined to be k(esolv + Ag+) ) (2.6 ( 0.6) × 1010 M -1 s-1.(More)
The diethyl carbonate, DEC, is an ester that is used as a solvent in Li-ion batteries, but its behavior under ionizing radiation was unknown. The transient optical absorption spectra, the decay kinetics, and the influence of various scavengers have been studied by using the picosecond laser-triggered electron accelerator ELYSE. In neat DEC, the intense(More)
The ester propylene carbonate (PC) is a solvent with a high static dielectric constant where the charges generated by ionizing radiation are expected to be long-lived at room temperature. Time-resolved optical absorption spectroscopy after picosecond electron pulses reveals the formation of a UV band, within less than two nanoseconds, that is assigned to(More)
A phenomenological approach is proposed that takes into account the nuclearity-dependent binding energy in a cluster to determine its influence on the earliest steps of the homogeneous nucleation process and to determine the limits of the metastability/supersaturation domain for the monomer-condensed phase transition. It appears that the temperature at(More)
The yields of the radiolytic oxidation of U(IV) and of the U(VI) formation, measured by spectrophotometry, are found to be the same (G(-U(IV))(N2O) = G(U(VI))(N2O) = 8.4 x 10(-7) mol J(-1)) and almost double the H(2) formation yield (G(H(2)) = 4.4 x 10(-7) mol J(-1)) in the (60)Co gamma radiolysis of N(2)O-aqueous solutions in the presence of 2 mol L(-1)(More)